Copy right in Cambodia is not different from the other countries in the world. The date of entry into force is in  May  3, 2003.

The Law specifically excludes from protection all laws, regulations, government circulars,
court decisions, and their translations, as well as any idea, formality, method of operation, concept,
principle, discovery or mere data, even if expressed, described, explained or embodied in a work.
Works are protected whether publicly disclosed or not. A work is deemed created by the sole fact of
the realization, even if incomplete, of the author’s idea. for more detail about the law of copy right in Cambodia, visit http://bnglegal.com/sys-content/uploads/2013/04/Copyright-Law-in-Cambodia.pdf

How about fair use guidelines for teacher in Cambodia? I can not search whether it is applied in Cambodia or not? Anyone know about that, please share with me, thank you.