Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
cong thanh » dong thanh, cong trinh, cong tan
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong manh » cong danh, duong manh, hoang manh
toan tap » toan ban

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 (nhieu tang)) - canh tranh cua nhung ((cong manh) OR (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (nhieu tang)) - canh tranh cua nhung ((cong manh) OR (cong thanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (nhieu tang)) - canh tranh cua nhung ((cong manh) OR (cong thanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (nhieu tang)) - canh tranh cua nhung ((cong manh) OR (cong thanh)) toan tap*.