Perhaps you should try some spelling variations:
theo chiet » theo chieu, thep thiet
chiet tach » chieu sach
trinh hoan » trinh han, trinh hoa, trinh chuan
trinh toan » tinh toan, thanh toan, trinh han
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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 chiet tach - hanh ((trinh hoan) OR (trinh toan)) nhung ((cong dan) or (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chiet tach - hanh ((trinh hoan) OR (trinh toan)) nhung ((cong dan) OR (cong san)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chiet tach - hanh ((trinh hoan) OR (trinh toan)) nhung ((cong dan) or (cong san)) than cau".
• Adding a wildcard symbol may retrieve word variants: theo chiet tach - hanh ((trinh hoan) OR (trinh toan)) nhung ((cong dan) or (cong san)) than cau*.