Perhaps you should try some spelling variations:
thanh trung » thanh tung
thanh nhung » thanh hung, hanh nhung, thanh chuong
tranh nhung » trinh nhung, tranh hang, tran hung
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
cong san » cong tac
san ban » sang ban, van ban, can ban
ban dan » ban hang, ban hanh, ban quan

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)) - thanh trung ((thanh nhung) or (tranh nhung)) cong san ban dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - thanh trung ((thanh nhung) OR (tranh nhung)) cong san ban dan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - thanh trung ((thanh nhung) or (tranh nhung)) cong san ban dan".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - thanh trung ((thanh nhung) or (tranh nhung)) cong san ban dan*.