Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham hoi » cham voi, cham h'roi, pham hoai
ban hanh » ban hang
tang ma » tang van
hoi ban » hoi dan, hoi bai, doi ban
cua tre » cua te, cuu tre, cua triet
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 ma) OR (mang may)) hoi. hieu van cham hoi ban hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((tang ma) or (mang may)) hoi. hieu van cham hoi ban hanh vi cua tre*.