Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hung thang » cang thang, hung tran
dung cong » dung trong
thang va » hang va, trang va, thong va
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung
tra cau » tra sau, ta cau, tra cuu

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 (chiet tach)) - hung thang va dung cong tac ((tra cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chiet tach)) - hung thang va dung cong tac ((tra cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chiet tach)) - hung thang va dung cong tac ((tra cau) or (toan cau))*.