Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hanh tran » hanh trang, thanh tran, hanh tram
hang cong » dang cong, hang nong, bang cong
25 trieu » 30 trieu
tran van » luan van
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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: 25 trieu tinh - hanh tran van ((nhung cong) OR (hang cong)) dan ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "25 trieu tinh - hanh tran van ((nhung cong) OR (hang cong)) dan ((than cau) or (than cap))~".
• Adding a wildcard symbol may retrieve word variants: 25 trieu tinh - hanh tran van ((nhung cong) OR (hang cong)) dan ((than cau) or (than cap))*.