Perhaps you should try some spelling variations:
vien nganh » vien thanh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, nhung don
hiem ngan » kim ngan, viem gan
hang cong » dang cong, hang nong, bang cong
trang va » tran van, hang va
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 (vien nganh)) - hanh trang va ((nhung cong) OR (hang cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (vien nganh)) - hanh trang va ((nhung cong) OR (hang cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hiem ngan) or (vien nganh)) - hanh trang va ((nhung cong) OR (hang cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) or (vien nganh)) - hanh trang va ((nhung cong) OR (hang cong)) dan toan cao*.