You Do Need power plug adapter while traveling from Bulgaria to Vietnam.

Here is Why You Need An Adapter

The outlet and plug type used in Vietnam are A, B and C and in Bulgaria are C and F. This is how they look like.


Bulgaria

In Bulgaria, outlets of type C and F are in use.

Type C
Type F

Vietnam

In Vietnam, outlets of type A, B and C are in use.

Type A
Type B
Type C

Plug and Socket Compatibility Checker

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