Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trung dap » trung cap, trung dai, trung dam
trong dam » trong lam, trong nam, trong cac
khoan cam » khoa cam, khoan va, phan cam
cong dan » cong tan, huong dan, cong dong
cong san » cong tac

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 - thanh ((trung dap) or (trong dam)) nhung ((cong dan) OR (cong san)) khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh ((trung dap) OR (trong dam)) nhung ((cong dan) OR (cong san)) khoan cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((trung dap) or (trong dam)) nhung ((cong dan) OR (cong san)) khoan cam".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((trung dap) or (trong dam)) nhung ((cong dan) OR (cong san)) khoan cam*.