Famed for their hospitality but also ethnic Thai have certain rules in eating, sleeping, talking that you need to know when to Northwest.Thai people in Vietnam was divided into three main groups are the Black, White and Red Thai. Differentiation is under colored scarf wrapped the Thai woman on the head. This nation has a population of No. 3 in Vietnam, living mainly in the mountainous northwestern province. If you visit a Thai family, there are some things you need to know.