Perhaps you should try some spelling variations:
ban hanh » ban hang
ky tang » ky dang, kho tang, ky trong
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cham so » cham soc, ham so, cham hoi
cua tre » cua te, cuu tre, cua triet
cham o » cham soc
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 ((ky tang) OR (ky nang)) mai hoi. hieu ve ((cham so) OR (cham o)) ban hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu cac ((ky tang) or (ky nang)) mai hoi. hieu ve ((cham so) or (cham o)) ban hanh vi cua tre*.