Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
phan cong » thanh cong
cong khan » cong khanh, cong nhan, cong phan
doc hieu » hoc thieu, hoc hien
dung php » dung phu, dung phan, dung phat
php phan » phap phan, phe phan, phi phan
khan dan » nhan dan, khau dan, khan dam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) tinh - thanh dung php phan cong khan dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - thanh dung php phan cong khan dan ca.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - thanh dung php phan cong khan dan ca*.