Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
sang than » cang thang, dang thanh, sang tao
hoc hieu » hoc thieu, hoc hien, doc hieu
tram van » tran van, trang van, tranh van
san than » san thanh, ban than, van than
tam van » nam van, dam van, tom van

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 hieu nganh - hanh ((tram van) OR (tam van)) nhung cong ((san than) OR (sang than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu nganh - hanh ((tram van) or (tam van)) nhung cong ((san than) OR (sang than)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - hanh ((tram van) or (tam van)) nhung cong ((san than) OR (sang than)) cao*.