粵語中是否有越南語?

It's actually the other way around - Vietnamese contain Cantonese words and sounds! Vietnam used to be part of the greater China a lot time ago an guess what - Cantonese was the official language in those days!

未必，不過要花時間去考證。更可況粵語及越南語基本上你中有我，我中有你，很難計的。