Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, mot chieu
tran tuan » tran xuan, tran thanh, tranh luan
tong cong » trong cong, cong cong, dung cong
cong tan » cong tac, cong san, cong thanh
tan ca » tan cua, tang ca, dan ca
ca cau » cua cau, cac cau, can cau

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 ((tran tuan) OR (tran quang)) tong cong tan ca cau~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((tran tuan) or (tran quang)) tong cong tan ca cau*.