Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tang » thanh thang, thanh trang, thanh tung
bang cong » dang cong, bang song, hang cong
tang cua » mang cua, hang cua, tang luan
cua bang » chua bang, cua ban, cua dang
cong ban » cong bang, cong san, cong tan
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chiet tach) or (chinh sach)) - thanh tang cua bang cong ban ((than cao) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (chinh sach)) - thanh tang cua bang cong ban ((than cao) OR (toan cao))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chiet tach) or (chinh sach)) - thanh tang cua bang cong ban ((than cao) OR (toan cao))*".