Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh vant » trinh vat, trinh han, trinh viet
trinh van » trinh han, trinh quan, trinh toan
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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: ho chieu sach - hanh ((trinh van) or (trinh vant)) dang ((cong tan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((trinh van) OR (trinh vant)) dang ((cong tan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trinh van) or (trinh vant)) dang ((cong tan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh van) or (trinh vant)) dang ((cong tan) OR (cong san)) toan cau*.