On: Completely different languages tend to group colors in roughly the same way

[hihihihi1234]

I'm not sure the Vietnamese word comes from Chinese, even if the meaning is the same. Your link says that the Vietnamese word that's a cognate of the Chinese one is thanh not xanh.

Vietnamese is from a completely different language family to Chinese, although it's been influenced by Chinese over the centuries.

[dustintrex → hihihihi1234]

Xanh is also a cognate of the same character: https://en.wiktionary.org/wiki/xanh

[hihihihi1234 → dustintrex]

I stand corrected.