Perhaps you should try some spelling variations:
ban hanh » ban hang
kho tang » cao tang
cac kho » cac khoi, cac khoa, cac khu
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
tai hoi » tai khoi, tai hai, tai hoe
dai hoi » dai hoc, dai hai, dai moi
ve ham » ve cham, le ham, ve am
ham so » nam so, cham soc
so ban » sao ban, so bang, co ban
vi cua » di cua

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: tu cac kho tang ((tai hoi) OR (dai hoi)). hieu ve ham so ban hanh ((vi cua) OR (vai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac kho tang ((tai hoi) or (dai hoi)). hieu ve ham so ban hanh ((vi cua) OR (vai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac kho tang ((tai hoi) or (dai hoi)). hieu ve ham so ban hanh ((vi cua) OR (vai cua)) tre*.