Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
nhung cong » dung cong, thong cong, hang cong
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac
tang va » trang va, tang van, thang va

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 (chieu sach)) - anh tang 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 (chieu sach)) - anh tang va nhung cong tac ((than cap) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (chieu sach)) - anh tang va nhung cong tac ((than cap) or (khan cap))*.