Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, mot chieu
hanh tran » hanh trang, thanh tran, hanh tram
hung cong » hung cuong, phung cong, dung cong
ho chieu » theo chieu, hoc thieu, mot chieu
tran van » luan van
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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: ((ho chieu) OR (doi chieu)) sach - hanh tran van ((hung cong) OR (nhung cong)) dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - hanh tran van ((hung cong) OR (nhung cong)) dan than cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - hanh tran van ((hung cong) OR (nhung cong)) dan than cau*.