Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
ho trieu » mot trieu, 25 trieu, 30 trieu
tran van » luan van
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho trieu tinh - hanh tran van ((nhung cong) or (dung cong)) ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho trieu tinh - hanh tran van ((nhung cong) OR (dung cong)) ((dan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: ho trieu tinh - hanh tran van ((nhung cong) or (dung cong)) ((dan toan) or (dan than)) cau*.