Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cuc ban » cua ban, cuu ban, duc ban
cac ban » cac dan, cac van, can 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: thu sach tri nang xa hoi. hieu van cam ((cuc ban) OR (cac ban)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: thu sach tri nang xa hoi. hieu van cam ((cuc ban) or (cac ban)) hanh vi cua tre*.