Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
anh tang » anh bang, anh dang, anh nang
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac
tang va » trang va, tang van, thang 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 - anh tang va ((hang cong) OR (dang cong)) dan ((than cap) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - anh tang va ((hang cong) OR (dang cong)) dan ((than cap) OR (khan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - anh tang va ((hang cong) OR (dang cong)) dan ((than cap) or (khan cap))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh tang va ((hang cong) OR (dang cong)) dan ((than cap) or (khan cap))*.