Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
tuan tong » toan tong, thuan trong, toan thong
tong cong » trong cong, cong cong, dung cong
san tuan » van tuan, san luan, san quan
cong san » cong tac
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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 (chieu sang)) - thanh san tuan tong cong san ((than cau) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - thanh san tuan tong cong san ((than cau) OR (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - thanh san tuan tong cong san ((than cau) OR (phan cau))*.