All long-stay visas in Vietnam – Vietnam Guide – Expat.com

Invalid passport: A damaged passport or one with insufficient validity (less than six months) will be denied. Prior visa violations: Vietnam does not take prior violations lightly – especially within the country—and has something called the “black list.” You will be informed of being put on the “black list” and will need to pay …

https://www.expat.com/en/guide/asia/vietnam/9041-visas-for-vietnam.html