Thai people, they have been in the Northwest of Vietnam for over 1200 years, are descendants of Thai immigrants from the land of Yunnan province, China now. Thai groups: Black Thai, White Thai, Thai Red. Some groups have little or no clearly defined population, such as Tay Muoi (living in combination with Tay Thanh and Tay Muong groups in Nghe An). Thai people have their own language and scripts. Ethnologists now refer to this group as the Thai-speaking group ... Austronesian-Thai. Since there is a common source, the Thai language has a high consistency. This is a feature that most people notice when exposed. This is monophonic, with tone. Construct sentences in order: predicate subject of other components.