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, hang cong
hiem ngan » kim ngan, viem gan
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
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 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 dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) or (vien nganh)) - hanh trang va nhung cong dan toan cao*.