Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
ban thanh » ban hanh, ban hang
phan cua » nhan cua, than cua, phat 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 phan 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 phan 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 phan cua tre*.