Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
dung cong » dung trong
quang va » quang van, quan va, quang ma
cong san » cong tac
san tran » tan tran, ban tran, dang tran
tran cau » tran chau, toan cau, ran cau
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (chinh sach)) - nhanh quang va dung cong san tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chinh sach)) - nhanh quang va dung cong san tran cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chinh sach)) - nhanh quang va dung cong san tran cau*.