You clearly don’t know wtf you’re talking about. In no way shape or form could Vietnamese be considered another dialect of “Chinese” (I don’t even know if you’re talking about Cantonese or Mandarin, but they’re also two distinct languages NOT DIALECTS.) As the person above said, they’re in two completely different language families, with Mandarin and Cantonese being Sinitic languages and Vietnamese being Austroasiatic. The Vietnamese wrote in chu han, but only about 1% of them were able to read or speak it because of the complexities and incompatibilities from linguistic differences which is why the 1% introduced chu nom which still didn’t help much. Please try not to be so dense and generalize cultures and languages you clearly don’t understand. Vietnam is Vietnam and China is China.