Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
tu bac » tu ban, tu cac, tu bat
tu san » thu san, tu ban, tu can
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 bac) OR (tu san)) ky nang x hoi. hieu van cam ((cuc ban) OR (cuu van)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((tu bac) or (tu san)) ky nang x hoi. hieu van cam ((cuc ban) or (cuu van)) hanh vi cua tre*.