Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
quan trong » gian trong
doi chieu » doc hieu, doi chi, ho chieu
hanh tran » hanh trang, thanh tran, thanh trang
hanh tram » hanh tam, hanh trang, thanh tran
cong dan » cong san, cong tan, huong dan
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - ((hanh tran) OR (hanh tram)) quan trong cong dan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh tran) OR (hanh tram)) quan trong cong dan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh tran) OR (hanh tram)) quan trong cong dan ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh tran) OR (hanh tram)) quan trong cong dan ((toan cao) or (toan tap))*.