In 1960 Ho Chi Minh gave an interview in a Soviet political anthology, and even if it is highly unlikely either he or the Soviets told the truth the wording here is interesting (my italics): "At first, patriotism, not yet communism, led me to have confidence in Lenin, in the Third International. Step by step, along the struggle, by studying Marxism-Leninism parallel with participation in practical activities, I gradually came upon the fact that only socialism and communism can liberate the oppressed nations and the working people throughout the world from slavery." Later on and through the rest of his life he would keep repeating the same inconvenient fact: his project was one of extreme nationalism, and ethnic patriotism. Nothing less, and most likely nothing more (in the end, Leninism was just his tool). I don't think the Vietnamese communist government was actively persecuting ethnic minorities in Vietnam though, probably because the Vietnamese population was so dominant and growing so rapidly it wasn't necessary. The most dominant non-Vietnamese ethnicity shrank, mostly due to low TFR and emigration.
https://hell.twtr.plus/media/51/5f/66/515f66442b06767d2384f607e4a9d9f8bbd246281827b9ee37ce3628b64c2107.file