Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh hoan » trinh han, trinh toan, trinh chuan
trinh hoa » trinh do, trinh han
bang cong » dang cong, bang song, hang cong
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
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 hoan) or (trinh hoa)) bang cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((trinh hoan) OR (trinh hoa)) bang cong ban than cau.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((trinh hoan) or (trinh hoa)) bang cong ban than cau*.