Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
tranh va » tranh van, trang va, trinh va
cong tac » cong ty
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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 sach) or (hieu lang)) - canh tranh va nhung cong tac ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu lang)) - canh tranh va nhung cong tac ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu lang)) - canh tranh va nhung cong tac ((than cau) or (toan cau))*.