You Do Need power plug adapter while traveling from Liechtenstein to Cambodia.

Here is Why You Need An Adapter

The outlet and plug type used in Cambodia are A, C and G and in Liechtenstein are C and J. This is how they look like.

Liechtenstein

In Liechtenstein, outlets of type C and J are in use.

Type C

Type J

Cambodia

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

Type A

Type C

Type G