You Do Need power plug adapter while traveling from Syria to Thailand.

Here is Why You Need An Adapter

The outlet and plug type used in Thailand are A, B, C and O and in Syria are C, E and L. This is how they look like.

Syria

In Syria, outlets of type C, E and L are in use.

Type C

Type E

Type L

Thailand

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

Type A

Type B

Type C

Type O