Perhaps you should try some spelling variations:
doi chieu » doi chi, ho chieu, mot chieu
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
cong dan » cong san, cong tan, huong dan
va dung » van dung, va duong, vat dung
dan van » dang van, doan van, dao van

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) OR (doc hieu)) sach - ((anh tang) or (anh dang)) va dung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - ((anh tang) OR (anh dang)) va dung cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - ((anh tang) or (anh dang)) va dung cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - ((anh tang) or (anh dang)) va dung cong dan van ban*.