Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » dung cong, thong cong, hang cong
trung va » truong va, trang va, trung ha
cong tac » cong ty
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chiet tach) or (nhieu tang)) - hanh trung va nhung cong tac ((than cap) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (nhieu tang)) - hanh trung va nhung cong tac ((than cap) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (nhieu tang)) - hanh trung va nhung cong tac ((than cap) or (khan cap))*.