Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
khai sang » kha nang, nha sang, thai bang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban
tung ha » trung ha, dung ha, tang ha
tung ho » tuong ho, trung hoc, trung hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((phi san) or (khai sang)) - thanh ((tung ha) or (tung ho)) nhung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((phi san) OR (khai sang)) - thanh ((tung ha) OR (tung ho)) nhung cong tan toan ban.
• Adding a wildcard symbol may retrieve word variants: doi ((phi san) or (khai sang)) - thanh ((tung ha) or (tung ho)) nhung cong tan toan ban*.