Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
luan chung » luan chinh
doi chieu » doc hieu, doi chi, ho chieu
hanh ban » thanh ban, hang ban, hanh san
ban luan » bang luan, ban quan, bai luan
cong van » cong vang, cong san, song van
cong tac » cong ty
than cau » toan cau, phan cau, than cap

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: doi chieu sach - hanh ban luan chung ((cong van) OR (cong tac)) than cau~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ban luan chung ((cong van) or (cong tac)) than cau*.