STATE OF KNOWLEDGE AND BEHAVIOR OF THE TRANSMISSION OF HIV AMONG HMONG ETHNICITY FROM 15 TO 49 YEARS OF AGE IN TAMDUONG DISTRICT, LAICHAU PROVINCE A cross sectional survey was conducted on 799 people (389 men and 410 women) of Hmong ethnicity from 15 to 49 years of age in 4 communes of Tam Duong district, Lai Chau province by direct interview method. The results showed that: On education: university / college level was only 0.1% of the sample, high school was 1.3%, secondary school was 14.0%, primary school was 16.1%, and up to 68.3% of the sample was illiterate.