Many Singapore developers are going in to build condo, office in Cambodia. Newspaper also occasionally advertise those properties.
Surprisingly many Singaporean, Taiwanese, Japanese, France, and some other countries are buying and investing.
So I try to do research on exploring business in Cambodia since the economy is growing fast.

If you have
1. businesses in Cambodia
2. plan to expand your business to Cambodia
3. just want to invest in the property (be it residential or commercial)

Read this doing business in Cambodia article to understand which best business/industry to explore into.