Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
thanh tang » thanh thang, thanh trang, thanh tung
dang thanh » dong thanh, dang hanh, hoang thanh
quan hang » quan hoang, quan hanh, qua hang
quan lang » quan hoang, gian lang, quan luan
cong dang » cong dong, cong dan, cong dung
thanh lap » thanh san, phan lap, thanh hai

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 (chiet tach)) - thanh tang ((quan hang) or (quan lang)) cong dang thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - thanh tang ((quan hang) OR (quan lang)) cong dang thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chiet tach)) - thanh tang ((quan hang) or (quan lang)) cong dang thanh lap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chiet tach)) - thanh tang ((quan hang) or (quan lang)) cong dang thanh lap*.