Perhaps you should try some spelling variations:
nhiet tach » chiet tach
hoc nhiet » hoc thiet, hoc nghien, hoc hien
trang van » tran van, trang va, trong van
trong ban » trong san, trong tan, trong quan
tram van » tran van, tam van, tranh van
ban hang » ngan hang
hang cau » hang dau, hang ca, nhung cau

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 nhiet tach - hanh ((tram van) OR (trang van)) dung trong ban hang cau~.
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - hanh ((tram van) or (trang van)) dung trong ban hang cau*.