Perhaps you should try some spelling variations:
dong huong » dong thuong, dong duong, cong huong
doi chieu » doi chi, ho chieu, mot chieu
tranh van » trinh van, thanh van, tranh ban
doc hieu » toc thieu, hoc thieu, hoc hien
tran van » luan van
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - hanh ((tranh van) OR (tran van)) dong huong dan than man~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) sach - hanh ((tranh van) OR (tran van)) dong huong dan than man~".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - hanh ((tranh van) OR (tran van)) dong huong dan than man*.