Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong tan, huong dan, cong dong
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
can van » cac van, can ban, tan van
van va » van vat, van van, ban va

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 - can van va nhung ((cong dan) or (((cong san) OR (cong tac)))) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - can van va nhung ((cong dan) OR (((cong san) OR (cong tac)))) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - can van va nhung ((cong dan) or (((cong san) OR (cong tac)))) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - can van va nhung ((cong dan) or (((cong san) OR (cong tac)))) toan cau*.