It's alway a good idea to learn some basic phrases in the language of the country that you are visiting. Not only will it earn smiles and nods of approval but it will most likely encourage the locals to be more friendly since they know you are trying to learn their language.

Here are some simple phrases in Khmer:

 Hello - Jum reap sou (formal) or Sou sdey (informal)

Good bye -Jum reap leah (formal) or Leah hi (informal)

Yes - Baht (for men), Cha (for women)

No - Oht tey

Thank you - Ah kun

Sorry - Sohm tou

How much is this? - Tah ni thliy pun mann?

Expensive - Thliy

Where is...? - (Name of location), nouw ey na?