Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
luan phung » luan phuong, luan chung, luan hung
luan phong » luan phuong, xuan phuong, van phong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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 (chiet tach)) - ha dong ((luan phung) or (luan phong)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - ha dong ((luan phung) OR (luan phong)) cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chiet tach)) - ha dong ((luan phung) or (luan phong)) cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chiet tach)) - ha dong ((luan phung) or (luan phong)) cong tan toan cau*.