Perhaps you should try some spelling variations:
phan cong » thanh cong
cong dung » cuong dung, cong dong, cong luong
doc hieu » hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan cong » dang cong, van cong, dan dong
dung dat » dung va, dung tai
van chat » cao chat
dat van » dao van, dat va, dam van

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 - phan cong dan cong dung dat van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - phan cong dan cong dung dat van chat.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - phan cong dan cong dung dat van chat*.