@Valère ************************
Not all EU countries need a visa...
"I. Visa Requirement
1. A visa is required to enter Vietnam unless it is exempted.
2. German nationals do not need a visa if:
- they will not stay in Vietnam for more than 45 days, including the arrival and departure days (a proof such as an onward or return ticket may be required at the border); and
- their passport is valid for at least six (06) months upon entry.
3. The visa-free stay of 45 days is recalculated with each entry, regardless of the last entry, which happened with or without a visa. A minimum period between the last exit and the visa-free entry is not required.
4. The regulations in points 2 and 3 also apply to nationals of France, Italy, Spain, Great Britain, Russia, Japan, Republic of Korea, Denmark, Sweden, Norway, Finland and Belarus."