Perhaps you should try some spelling variations:
ban hanh » ban hang
kho tang » cao tang
cac kho » cac khoi, cac khoa, cac khu
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tai hoi » tai khoi, tai hai, tai hoe
dai hoi » dai hoc, dai hai, dai moi
ham so » cham soc
nam so » nam sao, nam bo
vi cua » vai 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) OR (nam so)) ban hanh vi 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) OR (nam so)) ban hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac kho tang ((tai hoi) or (dai hoi)). hieu ve ((ham so) OR (nam so)) ban hanh vi cua tre*.