Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
tuan dang » tuan bang, tuan dung, tuan duong
tran dang » tran quang, tran hoang, tranh hang
cong san » cong tac
than cao » toan cao, than cap, than sao
thai cao » tai cao, thoai cac, thuat cao

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 - thanh trung ((tuan dang) OR (tran dang)) cong san ((than cao) or (thai cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trung ((tuan dang) OR (tran dang)) cong san ((than cao) OR (thai cao))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - thanh trung ((tuan dang) OR (tran dang)) cong san ((than cao) or (thai cao))*".