Transit in Hongkong International Airport and want to go out of the airport and travel around

Heang, you can apply from the Chinese embassy in Cambodia or send your application to the HK Immigration Department by mail. Things you need to prepare include your passport, application form, photo, photocopy of proof of your financial standing, e.g. bank statements, savings accounts passbooks, tax receipts, etc. and proof of employment (if any), e.g. company leave letter, salary slips, etc., photocopy of flight itinerary, and photocopy of proof of the proposed visit in the next destination after visiting Hong Kong, itinerary, etc.

Thank you so much for your information!