Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trang » thanh trung, canh tranh, hanh trinh
trang cua » tranh cua, tang cua, trung cua
cua thong » cua thuong, cua khong, cua tong
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
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 (chieu sang)) - hanh trang cua thong ((cong ban) OR (cong tan)) than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - hanh trang cua thong ((cong ban) OR (cong tan)) than man.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - hanh trang cua thong ((cong ban) OR (cong tan)) than man".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - hanh trang cua thong ((cong ban) OR (cong tan)) than man*.