It’s great that there is one office of Vietnam embassy in Prague, Czech.
Vietnam’s embassy in Prague is the only Vietnamese representation in Czech up to now. This office provides services of visa issuance and consular legalization among others, and also the place that Vietnamese citizens in Czech should contact immediately if they lose their passport.
Regarding visa for Vietnam, in addition to embassy visa, citizens and residents of Czech has an alternative of getting a visa on arrival. You can see their brief below:
For details, you may also read: