... (Systematic sample) Mau xac su1ft 11 fy t1ft cii cac v~t co s6 thu t1,r N tTOng m<>t danh sach Mau phan t6 (Stratified sample) Mau xac xuat duge ch<.>n h,ra sao ... do rna kMng eMp nMn san ph1im thay tM, h<.> tim mua bang du'1c hllng do mm tMi. 74 Thu {haP thOng tin vi qua trinh va xu hllm.g mua hang cOO khach hang Philn ... danh gill, dung thu va chap nh~n. 76 Thu thqp thbng tin ve' qua trinh va xu huang mua hang cUa khfu-h hang Thuyet trinh ban hang theo mau (Canned approach) Thuyet tdnh ban...