Transfer money from Ireland to Cambodia

In the past I have transferred money to Thailand using Wise.  I always got a good exchange rate with low charges and fast transfer.

Last month I used Wise to transfer a small sum of money ($50) to an account with Advanced Bank Of Asia Lmited in Cambodia.  Wise charged a small fee but when the funds arrived in Cambodian bank only $41 was credited to the account.  Presumably Cambodian bank charged $9. 

Does anybody have any advice on how the send money to Cambodia without paying huge fees?

Thanking you in advance for any suggestions