Actually since Marxism is the theory and Communism is the practical implementation of Marxism, Vietnam is communist and they're known for their high levels of corruption, political censorship and a poor record on human rights. To which what might surprise you is that despite me being a Ukraine supporter, Vietnam's corruption is actually not as bad as Ukraine's corruption.
http://www.differencebetween.net/miscellaneous/difference-between-communism-and-marxism/
https://www.bbc.com/news/world-asia-pacific-16567315
https://www.transparency.org/en/cpi/2022