Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hiem ngan » kim ngan
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
tran van » luan van
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hiem ngan) OR (viem gan)) - hanh tran van nhung cong ((dan than) or (van toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (viem gan)) - hanh tran van nhung cong ((dan than) OR (van toan)) tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hiem ngan) OR (viem gan)) - hanh tran van nhung cong ((dan than) or (van toan)) tap*".