VISA

Visitors from some countries are allowed to enter without VISA (Italian visitors are allowed to enter without VISA for a period of up to 45 days. If during such period the visitor exits Vietnam and then re-enters a new stamp is added which allows her/him staying for other 45 days. See https://www.viaggiaresicuri.it/schede_paese/pdf/VNM.pdf).

Check for instructions the International Affairs Department of your country.