Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chau tinh » cuu tinh, ha tinh, cua tinh
hanh tran » hanh trang, thanh tran, hanh tram
tran tuan » tran xuan, tran quang, tran thanh
tuan hung » tran hung, luan hung, tuan dung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan ban » van ban

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

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