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