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

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: hoc ((vien nganh) OR (hiem ngan)) - hanh tran van nhung cong ((dan than) OR (ban than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((vien nganh) or (hiem ngan)) - hanh tran van nhung cong ((dan than) OR (ban than)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((vien nganh) or (hiem ngan)) - hanh tran van nhung cong ((dan than) OR (ban than)) cao*.