Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
chong cong » cong cong, thong cong, phong cong
cuong cong » cong cong, luong cong, duong cong
dong luan » dung luan, tong luan, dong xuan
tac toan » tap toan, tam toan, hach toan
toan cau » 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 ((chong cong) OR (cuong cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chinh sach)) - ha dong luan ((chong cong) OR (cuong cong)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chinh sach)) - ha dong luan ((chong cong) OR (cuong cong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chinh sach)) - ha dong luan ((chong cong) OR (cuong cong)) tac toan cau*.