Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
trung dap » trung cap, trung dai, trung lap
trung dam » trung tam, trung dai, trong dam
dan khanh » dang khanh, van khanh, dat khanh
dan khan » dan chan, dan than, dan khai

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