Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh vant » trinh vat, trinh han, trinh viet
trinh van » trinh han, trinh quan, trinh toan
dang cong » dung cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 ((trinh van) or (trinh vant)) dang cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((trinh van) OR (trinh vant)) dang cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((trinh van) or (trinh vant)) dang cong dan than cau*.