Посмотрите вот тут:
https://www.vietnam-briefing.com/news/covid-19-vietnam-travel-updates-restrictions.html/ Приведу цитату, обратите внимание на последнюю фразу:
Flag carrier Vietnam Airlines resumed some international flights connecting Hanoi and Ho Chi Minh City with South Korea, Japan, and Australia from April 3. Low-cost carrier VietJet has also resumed services including to Taiwan and Thailand. However, only repatriated approved Vietnamese citizens and approved foreign experts will be allowed to enter Vietnam
Ну и не забываем про обязательный 16-дневный карантин даже для привитых.