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

Here is Why You Need An Adapter

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

Bonaire

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

Type A

Type C

Vietnam

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

Type A

Type B

Type C