Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tran » hanh trang, thanh tran, hanh tram
van trong » van truong, vang trong, ban trong
tran van » luan van
cong san » cong tac
hang dau » hang va
hang tai » hang va, dung tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (hieu manh)) - hanh tran van trong cong san ((hang dau) or (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - hanh tran van trong cong san ((hang dau) OR (hang tai)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (hieu manh)) - hanh tran van trong cong san ((hang dau) or (hang tai))*.