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

Here is Why You Need An Adapter

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

Palestine

In Palestine, outlets of type C and H are in use.

Type C

Type H

Vietnam

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

Type A

Type B

Type C