Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
doanh quan » doanh quang, doanh luan, doan quan
hoc chieu » hoc thieu, ho chieu, hoc hien
trung cap » truong cao, trung tam
dang cong » dung cong
quan so » quan su, quan ao, quan doi

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 - thanh trung cap ((dang cong) or (cong dong)) doanh quan so~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - thanh trung cap ((dang cong) OR (cong dong)) doanh quan so.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - thanh trung cap ((dang cong) or (cong dong)) doanh quan so*.