Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
doi chieu » doc hieu, doi chi, mot chieu
hanh luan » khanh luan, hang luan, hanh luat
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, mot chieu
tran tap » toan tap, tran tan, tran tuan
luan va » luan van, luat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) OR (doi chieu)) xanh - hanh luan va ((nhung cong) or (hang cong)) tan tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - hanh luan va ((nhung cong) OR (hang cong)) tan tran tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) xanh - hanh luan va ((nhung cong) or (hang cong)) tan tran tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) xanh - hanh luan va ((nhung cong) or (hang cong)) tan tran tap*.