Difference between Viet and Tai.

What makes Viet and Tai/Thai or Chin different?

The eyes.

Observe Tai's eyes, they are double strong eyelids while the Viet most has single eyelid or hidden double eyelids. Of course there would be Viet with strong double eyelids and Thai with hidden double eyelids when observe look for the average #

Viet...

Tai/Thai

Now for the Chin, you would surprise to see many North Chin has strong double eyelids because they are like Thai came from Central Asia, R9F. Chin mixed a lot with Mongol and Manchus therefore they are more diverse.