(SKKN 2022) một số kinh nghiệm sử dụng quizizz trong việc kiểm tra đánh giá học sinh học online môn tiếng anh ở trường tiểu học

1 DEPARTMENT OF QUANG XUONG EDUCATION AND TRAINING QUANGTRUONG PRIMARY SCHOOL EXPERIENCE IDEAS THE NAME OF SUBJECT SOME EXPERIENCES OF USING QUIZIZZ IN THE ASSESSMENT OF STUDENTS LEARNING ENGLISH ONLINE IN PRIMARY SCHOOL Teacher Position : Le Thi Huong : Teacher Work place: QuangTruongPrimary School Subject : English QUANG XUONG, YEAR 2022 Table of contents Introduction 1.1 The reason to choose topic 1.2 The purpose of the research initiative 1.3 Research subjects 1.4 Research Methods 1.4.1 Theoretical research method 1.4.2 Observation survey method 1.4.3 Experimental teaching methods 1.4.4 Methods of summarizing and drawing experience Content 2.1 Theoretical basis of the initiative 2.2 Actual situation before applying experience initiatives 2.3 Measures used to solve the problem 2.3.1.How to set up a Quizizz account 2.3.2.Create Quizizz 2.3.2.1 Teachers create their own set of test questions 2.3.2.2 The teacher imports questions from the Quizizz library 2.3.3 Invite students to take the test 2.3.4 Evaluation of students' test results 2.4 Result and lessons 2.4.1 Result 2.4.2 Lessons learned Conclusions and recommendations 3.1 Conclusions 3.2 Recommendations References 3 4 4 5 5 7 8 11 12 13 13 16 17 17 18 19 Introduction 1.1 The choose a topic: During the recent years, our Party and State have always considered "Education is the leading national policy” The State has spent a lot of resources prioritizing investment in the development of education.The state has many sources.The 2nd Central Executive Committee meeting session VIII pointed out: “Strongly renovating educational and training methods, overcoming one-way communication, training creative thinking of learners Step by step applying advanced and modern methods into the teaching process ”[1] In the Education Law, Clause 2, Article 24 states: “The method of general education must promote students' activeness, self-discipline and initiative; suitable with the characteristics of each class and subject; fostering self-study methods, training skills to apply knowledge into practice, affect emotions, bring joy and excitement to students ”[2] Innovating the way of implementing teaching method is a key issue of Vietnam's education renovation policy in the current period Innovating ways of implementing teaching method will radically change the thinking and working style of the generations of students - the future owners of the country Thus, innovating teaching method will impact on every element of the education and training process It creates modernization of this process Innovating teaching method is not essentially replacing old teaching methods with a series of new teaching methods In essence, "Innovating teaching method is innovating the way of conducting methods, innovating means and methods of deploying methods on the basis of thoroughly exploiting the advantages of the old methods and applying flexibly some new methods to maximize the active, active and creative learners "[5] The purpose of innovating teaching method is how to make students really active, proactive, self-conscious, always anxious to explore, think and create in the process of acquiring knowledge and comprehending both ways to acquire that knowledge to develop and perfect your personality In particular, the foreign language - English subject, is one of the languages that acts as a positive means to support the most effective integration process of the country Therefore, improving the quality of education in general and the quality of English subjects in particular is one of the top concerns of the current educational career And that is paying more attention to primary school students who are just beginning to access foreign languages Learning English in elementary school helps students build and develop their communication skills through listening, speaking, reading and writing skills, and is one of the important starting points that contribute to the formation and development of English develop lifelong learning skills, future work capacity and ability to participate in socio-cultural activities Learning English in elementary school also creates the foundation for continuing to learn English at subsequent levels as well as equipping basic language learning skills to learn other languages in the future Over the past two years, the COVID-19 epidemic has seriously affected all aspects of social life Education and training is one of the industries heavily affected by this pandemic, but this is also a push for us to change our management thinking and promote creativity in each individual, family, and home schools and the entire education sector, improving the ability to adapt to new circumstances and providing an opportunity to promote digital transformation and innovation in education The school year 2021-2022 is a special and difficult school year for all professions, including education and training Together with the whole country in epidemic prevention and control to ensure "Stop going to school but don't stop learning" the education and training sector has had many solutions, of which online teaching is one of the solutions implemented so far Also in the context of the epidemic, I myself and many other teachers have overcome difficulties, actively and flexibly converted to online teaching Many teachers have promoted creativity to find ways to bring lessons and knowledge to students In fact, the younger the student, the more difficult it is to learn online due to psychological characteristics such as the ability to concentrate, the ability to interact with technology, etc This is an issue that teachers and parents need to pay special attention to them In particular, children have to study a lot of subjects at the same time, for a long time online, children easily lose focus, get bored of studying and lose interest in learning Stemming from that fact, I have researched websites, applications, software such as: Violet, Quizizz, Wordwall, Padlet, Kahoot, Google from, from in Team [8], … combined in these Online lessons help students understand the lesson, the lecture is not dry and boring in each class Besides, I would like to find a software, or an application to combine with online teaching applications to help reinforce the knowledge after each lesson, and especially help them to complete the learning process take the initiative in learning, review the knowledge after each topic, each lesson" During the teaching process, I became acquainted with and used Quizizz software - an application used to test and assess knowledge in English through the form of multiple choice answers The multiple-choice questions in Quizizz belong to many categories with different levels for students to try and assess their own level; or teachers, parents can access questionnaires shared by others to use in teaching and tutoring their children Overall, Quizizz is suitable for both home and classroom learning From that point of view, I have chosen the topic "Some experiences of using Quizizz in the assessment of students learning English online in primary school" to provide some solutions that I have personally learned and will continue to promote to test and evaluate students' knowledge, and at the same time bring Quizizz into the lesson to help change the atmosphere in online classes, make lessons less stressful and easier to understand, and help learners easy to remember and absorb knowledge deeply.These are my little experiences, I have done and achieved very good results We hope that these experiences contribute to complement and enrich the teaching methods of colleagues 1.2 The purpose of the research initiative 5 The purpose of the topic is to study the situation of foreign language teaching for elementary school students and foreign language learning of elementary school students, their interest in the subjects and methods of learning foreign languages by using Quizizz - Thereby finding the strengths and weaknesses of their learning method, as well as in the teacher's teaching method, thereby proposing solutions to improve the quality of foreign language subjects in elementary schools 1.3 Research subjects Research using using Quizizz to create interest in learning English for elementary students 1.4 Research Methods In this topic, I have used the following research methods: 1.4.1 Theoretical research method Read some books, reference materials, search the Internet for documents related to the use of using Quizizz in English lessons 1.4.2 Observation survey method: In order to research the subject in depth, I investigated the reality of teaching and learning English in elementary school Interview and schedule English teachers, combined with professional teams and school administrators 1.4.3 Experimental teaching methods: I have conducted English classes to apply the found methods to teaching 1.4.4 Methods of summarizing and drawing experience: After each lesson period, using the form of teaching in the topic, I often summarize and draw experience for each lesson; Continuing to change and innovate to suit the following lessons After each stage is also compared, summarized to draw common experience 2.Content 2.1 Theoretical basis of the initiative In recent years, the education sector has always been innovated in terms of goals, content and methods as well as active teaching arrangements, contributing to improving the quality of education For any subject, it is very important to engage students and engage them in lessons That not only helps them understand the lesson faster, but also helps them deepen their knowledge and remember the lesson better Since then, their ability to think and focus is newly developed Thus, to have an interesting lesson for students requires teachers to be more prepared and invested than normal classroom lessons, even the process of accumulating experience over time can be effective and persuade students, make them really interested and focus on the lecture It is a requirement, an important goal of the teaching process, especially for English teachers Primary education is an important level that contributes to laying the foundations for the formation and development of student's personality In elementary schools today, English is taught as a basic foreign language, an independent subject, taking up a lot of time in the curriculum of children Like other subjects, English is designed to provide initial knowledge about foreign languages, helping students to have a new communication tool in their first language, initially developing the ability to identify Critical thinking and prelinguistic skills in practicing English communication in four forms of listening, speaking, reading and writing In addition, learning English also helps students build their ability to express personal ideas confidently, independently and creatively In the context of the increasingly complicated covid pandemic, online teaching via the Internet is a form of achieving the purpose of education Online learning via the Internet ensures the basic principles of cognitive processes in education Besides, online learning also has many advantages in line with the development trend of society, creating a foundation for students to have study skills to higher education levels Currently, online teaching via the internet has been widely popularized, but in essence, it is also difficult and the effectiveness is not really high Therefore, the teaching method of teachers has a great influence on the learning process of students From that point of view, I believe that the active teaching method using Quizizz software is one of the effective methods to meet the requirements of teaching English in the new situation 2.2 Actual situation before applying experience initiatives The primary school English program is built based on the needs of Vietnamese society and the psycho-physiological characteristics of primary school students, so in terms of content, it is very interesting, attractive and close to the daily lives of students em However, English is a difficult subject for students in absorbing new knowledge, understanding and grasping the subject content of the reading passages, new vocabulary, new structures, comprehensive development of all four skills listening, speaking, reading and writing Therefore, most students who not understand the lesson become bored and passive in class In particular, the epidemic situation was serious, the whole country struggled to fight the covid 19, so my school also had to miss classes for a long time, so many children forgot all their old knowledge, they scribbled even many of them have even forgotten the handwriting Right after the opening day of the new school year, in order to support the students to continue their studies on schedule, the school organized online teaching In the past time, I have researched the best ways to design online classes with students to achieve high learning In the school year 2021-2022, I was assigned to be in charge of teaching English 4th grade for 122 students I myself am very worried because with the psychology of primary school students, when studying online, they easily feel bored with the number of assignments assigned and easily have the psychology of doing homework not really interested At the same time, the children had a long break, so when they returned to study, they were very sluggish, bored, and unfocused The fading knowledge no longer remembers the key knowledge learned in 3rd grade Many children and their parents are stuck far away because of the epidemic situation and they are not near their children, so they cannot tutor their children for further study at home Many children are psychologically away from their parents, so they have a lot of psychological impact that makes them not concentrate when studying and often feeling sad, depressed Therefore, when imparting knowledge to students, teachers face many difficulties The results of the 4th Grade English level of interest survey are as follows: Class Total Mark 9-10 Mark7-8 Mark 5-6 Mark under Student % Student % Student % Student % s s s s 4A 40 10 16 40 15 37,5 12,5 4B 40 7,1 16 38 17 40,4 9,5 4C 43 22,5 23 57,5 15 Total 122 7,3 31 25,4 55 45 15 12,3 Table 1: Quality survey results at the beginning of the year for English in grades - Quang Truong Primary School With the desire to help students have light online lessons, not pressurized, engaging lessons that make students interested in learning, easy to absorb knowledge, I have boldly applied quizizz software to it teaching online by Organizing a live game with online multiple choice questions on personal computer devices, tablets, phones for students After finishing the Quizizz game, the teacher will have a fairly detailed statistics table about the players (students) such as: rankings, number of correct and incorrect answers Online teaching method applying quizizz assignment software has the optimal effect in attracting all types of students to the lesson, stimulating students' thinking ability, creativity, self-confidence and helping students to learn more They easily grasp as well as deepen the amount of knowledge they have learned Moreover, quizizz software with a diverse and rich question system, multiple choice, fill-in, pairing, crossword, drag and drop, can be effectively applied at any stage in a lesson That is why teachers can manage their learning and practice with a very vivid and complete statistics table in their Quizizz admin page 2.3 Measures used to solve the problem 2.3.1 How to set up a Quizizz account Quizizz is one of the most famous and widely used tools to support testing and assessment in teaching Currently, Quizizz has a Vietnamese version, which is very convenient for teachers in many subjects to continue applying to their subjects Teachers access the link: https://quizizz.com/[7] to register for a free account Then the teacher chooses Sign Up to create a new account (Figure 1) Here the teacher fills in his personal email or can use Gmail to register (Figure 2) Next, the teacher selects As a Teacher in the I'm using Quizizz screen (Figure 3) 8 Figure Figure Figure So we have created an account quickly Teachers can also go to View profile -> Edit profile to reset personal information if needed 2.3.2.Create Quizizz 2.3.2.1 Teachers create their own set of test questions With a simple but feature-rich design, teachers can easily use Quizziz to create a set of multiple-choice questions, organize a contest to evaluate students' learning results right in the online classroom, very easily To create a test, the teacher clicks Create a new quiz on the homepage (Figure 4) Next, the teacher enters the test name -> select the subject to test -> Next Figure The teacher continues to choose the type of question to use:  Multiple choice: Multiple choice question  Checkbox: multiple choice test with multiple answer options  Fill – in – the – Blank: Fill in the blanks  Poll: Survey form to collect information and student opinions  Open- Ended: Open-ended question format The teacher chooses an appropriate question type (Figure 5) Figure Suppose here we choose Multiple choice, the teacher creates questions and answer options, as shown ( Figure 6)  Press Option to change the question type  Click Add image to add an image to the question or answer  Click the button to choose the correct answer 10  Click Add answer option: to add an answer option  Click Time allotted to solve this question to set the answer time for the question (the lowest is seconds and the highest is 15 minutes)  Click SAVE to save the question Figure So we used Quizizz to create questions, it's simple And teachers can continue to choose question types to create new questions for the test Set the answer time for the question and click Save to save the question 2.3.2.2 The teacher imports questions from the Quizizz library Teachers can add a variety of question types available from the Quizizz library without spending a lot of time preparing tests for students This is also a method that I have used regularly and with great results Normally it takes me quite a while to prepare a test for my students, but when I learned about this amazing feature of Quizizz I was able to compose one or more tests in a short time In particular, this software possesses a huge amount of questions in all subjects and grades The questions can be accompanied by audio files, vivid images with the answers of each question With one account, teachers can create a quick quiz that suits their purposes and control a contest between students with specific statistics on who answers the fastest and most correctly At the same time, students will have their own assessment of their own learning ability, requiring them to master the knowledge and be really sharp when participating in competitions Teachers can access millions of ready-made questions created by the community of teachers on Quizizz every day To find more quizzes, follow these steps: 11 • Click the Search for Quizzes on any topic box on the main page • Click on the topic or title you want to check (Figure 7) • Choose the right question then click add question Figure After completing the questions for the test the teacher can set some additional information for his test In the right pane of the test the teacher can set:(Figure 8)  Add grades: Add student objects to the test  Add a title Image: Add an image for the title of the quiz  Select language: Select the language for the test  Select grades: Select students from grade to grade  Who can see this quiz: Set whether or not to allow others to see the quiz 12 Figure 2.3.3 Invite students to take the test After creating, teachers can use the quiz in ways, corresponding to modes: Play Live, Assign HW and Practice The first is online play, which means many people play at the same time Next is the assignment of homework, i.e the teacher will choose a certain time and ask your students to submit the work before that deadline Finally, the practice mode, this mode does not limit the number of times to play and does not save the results to the system Here, I will guide you to use the first mode, suitable when the class is taking place, you click Play Live.( Figure 9) 13 Figure The teacher continues to choose forms of play  Teams: Teams (usually held in class)  Classic: the traditional style of each player on device (very suitable for today's online teaching)  Test: Take the test seriously, requires login to take the test Teachers should choose the appropriate form of organization for their class The teacher then has two ways to invite students to participate  Ask students to visit joinmyquiz.com website and then enter the code to enter the game  Teachers click or share via… to share the link with students  Then the teacher clicks Start to start playing When the teacher selects Assign HW 14 In this option, the teacher can set the deadline to complete the test for students and also assign this exercise to multiple classes by clicking the Select button or entering the teacher's class name in the Assign to a class box Then teachers click Host Game and share the link and test code in the group zalo for students In addition to setting scores, quizizz also allows teachers to shuffle questions and answers so that when participating in the game, students really work independently and objectively Currently, the Quizizz tool has a class management feature, allows updating classes from Google Classroom (a free class management application from Google), sending new class invitation emails in Quizizz only with a mouse button, but not as convenient as other applications, so it is rarely used Instructors can also compose a set of questions on an excel template file and then update it into the system, instead of having to repeatedly edit questions in the web interface 2.3.4 Evaluation of students' test results When the quiz is over, the teacher goes to the Report section to see the statistics of the players' results for each game that has been held In the Game Highlight section above, you can see Quizizz's analysis of the last game such as the correct answer rate of the whole class, which questions have the most students choosing wrong, which questions students answer the longest or average answer time for each question Below you can track the statistical overview of the correct / incorrect answer rate of the whole class or the statistics for each question If it is a Live game mode, teachers can observe student results right on the server screen 15 In summary, through the actual teaching process in all grades, when I apply Quizizz software to my classes, I find it very effective, students grasp the lesson knowledge, are more interested, and enjoy learning English and the quality of student learning is gradually improved 2.4 Result and lessons 2.4.1 Result Reality shows that we will not well what we not like Only when we have interest or create interest in studying and working can we study and work with high efficiency With the psychology of primary school students, they easily feel bored with the number of assignments assigned and easily have the mentality of not really enjoying the work Therefore, with the characteristics of English subject, in addition to simply assigning exercises, exercises through competition will be very interesting for students Quizizz software is a typical software that helps teachers change the way they assign assignments to students in a positive way The software is designed to be simple when students can easily operate it on a phone or computer with an Internet connection With an account logged into this software, teachers can control a competition between students with specific statistics about who can answer the fastest and most accurately Students will then have their own assessment of their own learning ability, requiring them to master the knowledge and be really sharp when participating in competitions Taking advantage of this, I have often used this software for online and inperson teaching I have noticed that my students gradually become interested in learning English, boldly, and confidently increase their communication skills In this school year, I taught to conduct a video lesson of E-learning lecture for the ministerial exam, Unit 4: Did you go to the party? Lesson 2, In this lesson, I have integrated teaching with the use of Quizizz software into reviewing knowledge for students The lesson has been well appreciated by the 16 School Board and colleagues and recognized that the application of positive teaching methods has contributed to increasing teaching effectiveness, helping to arouse students' confidence and excitement in learning English Ss 4A are learning English online with Quizizz Picture2: Student 4B are in checking old lesson part We students are inherently shy and afraid to speak English Meanwhile, the speaking period in the program is limited and there is not much time for the children, so most of them cannot confidently say anything in front of class However, since applying the mind map in each lesson, I realize that my students gradually become much more courageous and confident Because each time they draw their mind maps, they have to make presentations Therefore, the children are trained in speaking and speaking in front of people and gradually their shyness is amazingly disappearing 17 Two students are taking part in English competition in Quizizz Teacher uses Quizizz in E-learning lesson Although it takes a lot of time to make an electronic lesson plan and sometimes encounters many technical difficulties, I am very happy to build a quality electronic lesson plan Because of that, I have brought my students many, interesting, and useful hours of study, The results that the students have achieved have made me love and passionate about teaching with applications Information Technology Therefore, after students go to school directly, I continue to use Quizizz software to help students review and consolidate 18 knowledge Therefore, the efficiency as well as the quality of teaching and learning of teachers and students every day is of higher quality The results of the 2nd midterm survey for grade students have made remarkable progress, specifically as follows: Test results after finishing the program, As follow: Class Mark 9-10 Mark 7-8 Mark 5-6 Mark under Total Total % Total % Total % Total % 4A 40 17,5 15 37,5 18 45 0 4B 42 11 26,2 16 38,1 15 35,7 0 4C 40 20 12 30 20 50 0 Total 122 26 21,3 43 35,2 50 43,5 0 Table 2: Year-end quality survey results English for grade students - Quang Truong Primary School 2.4.2 Lessons Learned: Every teacher has a different mindset and teaching style But they all have the same goal of imparting to the students the right knowledge, enough knowledge to help them understand the lesson and deepen the knowledge as quickly as possible However, to be successful in English teaching, it requires teachers to have a very appropriate teaching method to attract all students to join them Just like an artist, as long as they act really well, even someone who is not knowledgeable about art will enjoy watching until the last second Teachers can connect Quizizz to Google Classrooom to share their quizzes and instantly get results in Google Classroom After finishing the Quizizz game, our teachers will have a quite detailed statistics table about the players (students) such as: rankings, number of correct and incorrect answers You can use the game this to kick off the lesson Students can study on computers and phones It’s safe and suitable for online learning, helping to consolidate subject knowledge, this is also a review bank in testing and assessment Students always know the result without having to look up the answer and each question when the student gives the wrong answer, the student can review the knowledge of the lesson, and this can be done by the student in anywhere, unimpeded by space, time, and distance I myself am maintaining the above-mentioned teaching method and I think that all of us teachers should also actively use Quizizz software in teaching However, when applying the teacher also needs to comply with certain conditions First of all, each of us teachers must invest, prepare carefully for preparing students' tests, help students be active in class, get excited before learning a new lesson or increase their confidence children when standing in front of the class After applying this teaching method for a while, I would like to share some experiences that have been drawn from my own practice As I mentioned above, using Quizizz software in teaching really brings a lot of efficiency, but teachers also need to apply it flexibly and skillfully in each specific classroom condition Conclusions and recommendations 3.1 Conclusion 19 In short, how to apply it depends on each lesson and the purpose of the teacher, but obviously we must see Quizizz as a useful tool for student objects With this teaching and learning method, surely in the near future, every classroom will be a "miniature society", where our students will improve their English comprehensively because Not only are they trained in grammar, reading and writing skills, but they also have a real “language environment” to develop their communication skills, respond to engaging listening and speaking lessons and bring many effects Thus, the success of each teacher is also the success of Vietnamese education with the desire to renew the method of teaching foreign languages - teaching foreign languages in the direction of communication Above are some small experiences about methods to create interest in learning English for elementary students There are still many teaching methods to help students learn English well, which I will continue to study in order to contribute to improving the quality of this foreign language learning The issues presented above are only my own subjective opinions, so certain restrictions cannot be avoided I look forward to receiving the comments of colleagues and superiors' comments to make this topic more and more complete 3.2 Recommendations * For parents - Parents are regularly interested in monitoring and reminding children to study while at home - Encourage students to use Quizizz in studying at home to develop their thinking abilities and systems - Encourage children to study in groups and set up English speaking sessions or English clubs in class or grade to gradually become more active and confident - Ask them to always have the habit of reviewing to inculcate old knowledge * For the school - The school regularly organizes seminars to innovate and unify the methods of teaching, applying initiative experiences to make high-quality lessons * For the Education Department I look forward to the Education Department creating conditions for us to organize workshops, exchange experiences to supplement, giving us professional experience, contributing to improving the quality of teaching and learning in the spirit of innovation CONFIRMATION OF PRINCIPAL Quang Truong, April 10 th 2022 I swear this is my own initiative to write and not copy the content of others Author (Sign, clearly state full name) LE VAN TRUNG LE THI HUONG 20 REFERENCES Document of the 8th Party Congress [1] Document "Building a foreign language learning environment in elementary schools" - by Vinh University [6] 3.Document for developing a communication-oriented foreign language teaching method of the University of Foreign Languages, National University, Hanoi [8] Law on Primary Education [2] Primary Psychology syllabus - Bui Van Hue - Publisher Publishing House [5] Some resources from internet about Quizizz and teaching online [7] rd th , , 5th grade English textbook of the Publisher [3] rd th , , 5th grade English teacher book [4] 21 DANH MỤC SÁNG KIẾN KINH NGHIỆM ĐÃ ĐƯƠC HỘI ĐỒNG SÁNG KIẾN KINH NGHIỆM NGÀNH GIÁO DUC VÀ ĐÀO TẠO HUYỆN, TỈNH VÀ CẤP CAO HƠN XẾP LOẠI TỪ LOẠI C TRỞ LÊN Họ tên tác giả: Lê Thị Hương Chức vụ đơn vị công tác : Giáo viên trường Tiểu học Quảng Trường TT Tên đề tài SKKN Cấp đánh giá xếp loại Kết đánh giá xếp loại Năm học đánh giá xếp loại Some teaching techniques that excite to learn English for primary students Using mind map to teach English vocabularies at primary school Phòng GD&ĐT Quảng Xương B 2019-2020 Phòng GD&ĐT Quảng Xương B 2020- 2021 Sở GD&ĐT Thanh Hóa C 2020- 2021 Using mind map to teach English vocabularies at primary school ... SÁNG KIẾN KINH NGHIỆM NGÀNH GIÁO DUC VÀ ĐÀO TẠO HUYỆN, TỈNH VÀ CẤP CAO HƠN XẾP LOẠI TỪ LOẠI C TRỞ LÊN Họ tên tác giả: Lê Thị Hương Chức vụ đơn vị công tác : Giáo viên trường Tiểu học Quảng Trường. .. công tác : Giáo viên trường Tiểu học Quảng Trường TT Tên đề tài SKKN Cấp đánh giá xếp loại Kết đánh giá xếp loại Năm học đánh giá xếp loại Some teaching techniques that excite to learn English for... internet about Quizizz and teaching online [7] rd th , , 5th grade English textbook of the Publisher [3] rd th , , 5th grade English teacher book [4] 21 DANH MỤC SÁNG KIẾN KINH NGHIỆM ĐÃ ĐƯƠC