Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
than man » than ma, thanh san, tran manh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (nhieu tang)) - hanh tranh cua thong ((cong ban) OR (cong san)) than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (nhieu tang)) - hanh tranh cua thong ((cong ban) OR (cong san)) than man.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (nhieu tang)) - hanh tranh cua thong ((cong ban) OR (cong san)) than man".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (nhieu tang)) - hanh tranh cua thong ((cong ban) OR (cong san)) than man*.