The US has Coinbase so it is very easy to turn USD into Bitcoin for about 1% in fees. If Cambodia gets a similar service, then you will be able to send money to Cambodia for 2% and maybe even cheaper if the fees lower.
It might not be possible to send money right now, but in the future almost all countries will have big Coinbase like companies. Lots of money to be made there.
I think in three years bitcoin becomes faster and easier and cheaper than banks, PayPal, or Western Union to just about any major country in the world.
There are bitcoin traders all over the world. The OP should check the marketplace section of these forums for potential ways to sell bitcoin for fiat (and/or goods/services) in Cambodia