Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
tra quang » tran quang, tra quan, tranh quang
tri quang » tri quan, tai quang, trien quang
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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 ((tra quang) OR (tri quang)) thong cong dan khan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((tra quang) OR (tri quang)) thong cong dan khan cap".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((tra quang) OR (tri quang)) thong cong dan khan cap*.