ノービザで入国しベトナム出国後３０日以内はノービザで入れない。
Law No. 47/2014/QH13 dated June 16, 2014 of the National Assembly on entry, exit, transit,
and residence of foreigners in Vietnam
Chapter III
ENTRY
Article 20. Entry's conditions
1. The foreigner has a passport/laissez-passer and a visa.
Any foreigner that enters Vietnam and is unilaterally granted
visa-free entry must have a passport that is still valid for at least 06 months,
and the entry date must be at least 30 days from the previous exit;
