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

Here is Why You Need An Adapter

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

Jordan

In Jordan, outlets of type C, D, F, G and J are in use.

Type C

Type D

Type F

Type G

Type J

Vietnam

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

Type A

Type B

Type C