Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de 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 cach) OR (te sach)) ky nang x hoi. hieu van cam duc ((ban thanh) OR (ban hanh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (te sach)) ky nang x hoi. hieu van cam duc ((ban thanh) OR (ban hanh)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky nang x hoi. hieu van cam duc ((ban thanh) OR (ban hanh)) di cua tre*.