Perhaps you should try some spelling variations:
duong cuong » duong cong, duong vuong, duong truong
hieu nganh » vien nganh, hieu manh, nghiep nganh
thanh tung » thanh cong
hiem ngan » kim ngan, viem gan
cuong tap » luong tap, cong tac, luong tai
va duong » van duong, va tuong, va huong
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu nganh) or (hiem ngan)) - thanh tung va duong cuong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (hiem ngan)) - thanh tung va duong cuong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (hiem ngan)) - thanh tung va duong cuong tap toan cau*.