Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
luan chung » luan chinh
chung cong » nhung cong, chong cong, phung cong
dong luan » dung luan, tong luan, dong xuan
cong tac » cong ty
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
ha dong » hoat dong, van dong

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)) - ha dong luan chung cong tac ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chinh sach)) - ha dong luan chung cong tac ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chinh sach)) - ha dong luan chung cong tac ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chinh sach)) - ha dong luan chung cong tac ((toan cau) OR (toan cao))*.