Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
tranh van » trinh van, thanh van, tranh ban
dung cong » dung trong
tran van » luan van
cong dan » cong san, cong tan, huong dan
than man » than ma, tran manh, than phan

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 ((tranh van) OR (tran van)) dung cong dan ((than man) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((tranh van) OR (tran van)) dung cong dan ((than man) OR (thanh san))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((tranh van) OR (tran van)) dung cong dan ((than man) or (thanh san))*".