Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
trinh hant » trinh hanh, trinh thanh, trinh van
trinh han » trinh quan
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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) OR (chinh sach)) - hanh ((trinh han) or (trinh hant)) hang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chinh sach)) - hanh ((trinh han) OR (trinh hant)) hang cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chinh sach)) - hanh ((trinh han) or (trinh hant)) hang cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chinh sach)) - hanh ((trinh han) or (trinh hant)) hang cong dan toan cau*.