Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh mang » nhanh mang, hanh trang, nhanh lang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cao » toan cao, thai cao, 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: theo chieu sach - hanh mang ((cua cong) OR (va nhung)) ((cong dan) OR (cong tan)) than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh mang ((cua cong) or (va nhung)) ((cong dan) OR (cong tan)) than cao~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh mang ((cua cong) or (va nhung)) ((cong dan) OR (cong tan)) than cao*.