Perhaps you should try some spelling variations:
chi sach » chinh sach, chieu sach, co sach
thang ap » thang ay, thanh lap, thang tam
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
doi chi » doi khi
tang ap » tang van, tang tai, tang dan
can cau » van cau, ban cau, ca cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - thanh ((thang ap) OR (tang ap)) dung ((cong dan) or (cong tan)) can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - thanh ((thang ap) OR (tang ap)) dung ((cong dan) OR (cong tan)) can cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi sach - thanh ((thang ap) OR (tang ap)) dung ((cong dan) or (cong tan)) can cau".
• Adding a wildcard symbol may retrieve word variants: doi chi sach - thanh ((thang ap) OR (tang ap)) dung ((cong dan) or (cong tan)) can cau*.