... follow-up of treatment. Due to the after-working hours clinics, the opening hours were considerably inconvenient to the majority of FSW clients. Normally, the open hours were 6:0 0-8 :00, 11:0 0-1 3:30 ... services to hard-to-reach population will be further explored and discussed. Key words: public private partnership, HIV, STIs, FSW, IDUs, voucher scheme 1. Introduction In Vietnam, the private ... that the private sector provided 60% of all out-patient contacts in Vietnam. The number of private hospitals has increased from 43 in 2005 (MoH, Vietnam Health Report, 2006) to 83 in 2008 (MoH,...