Perhaps you should try some spelling variations:
thanh phat » thanh phan, thanh pham, thinh phat
ban thanh » ban hanh, ban hang
phat cua » nhat cua, chat cua, hai cua
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ((x hoi) or (o hoc)). hieu ((van lam) or (van nam)) duc ban thanh phat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((x hoi) OR (o hoc)). hieu ((van lam) OR (van nam)) duc ban thanh phat cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((x hoi) or (o hoc)). hieu ((van lam) or (van nam)) duc ban thanh phat cua tre*.