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 lap
trung dam » trung tam, trung dai, trong dam
hang cong » dang cong, hang nong, bang cong
khoan cam » khoa cam, phan cam, thuan cam
cong dan » cong san, cong tan, huong dan
khoan va » doan va, khoa ma, nhan va

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