Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
so sach » so sanh, bo sach, co sach
tuc van » thuc van, truc van, tuc va
van dau » van dao, phan dau
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
vi cua » vai cua, di cua
va cau » van cau, va cac, va dau
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ly nang ((o hoi) or (o hai)). lieu ((va cau) or (van dau)) tuc van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang ((o hoi) OR (o hai)). lieu ((va cau) OR (van dau)) tuc van thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ((o hoi) or (o hai)). lieu ((va cau) or (van dau)) tuc van thanh vi cua tre*.