Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trang va » hang va
tran van » luan van
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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 - hanh ((trang va) OR (tran van)) nhung ((cong dan) or (cong tan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trang va) OR (tran van)) nhung ((cong dan) OR (cong tan)) toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((trang va) OR (tran van)) nhung ((cong dan) or (cong tan)) toan tap*".