Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh tang » hanh trang, anh tang, hanh mang
cua bang » chua bang, cua dang, cua hang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - hanh tang ((cua bang) or (cua ban)) ((cong dan) OR (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh tang ((cua bang) OR (cua ban)) ((cong dan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh tang ((cua bang) or (cua ban)) ((cong dan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh tang ((cua bang) or (cua ban)) ((cong dan) OR (cong san)) toan cao*.