Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
cong tan » cong tac, cong san, cong thanh
tan doan » tran doan, tap doan, van doan
doan van » doan va, hoang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (theo tieu)) tinh - manh ((trung va) OR (trung ha)) nhung cong tan doan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo tieu)) tinh - manh ((trung va) OR (trung ha)) nhung cong tan doan van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo tieu)) tinh - manh ((trung va) OR (trung ha)) nhung cong tan doan van".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo tieu)) tinh - manh ((trung va) OR (trung ha)) nhung cong tan doan van*.