Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
tuc van » thuc van, truc van, tuc va
van dau » van dao, phan dau
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
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: su sach ly nang ((o hoi) or (o hai)). lieu ((va cau) or (van dau)) tuc van thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((o hoi) OR (o hai)). lieu ((va cau) OR (van dau)) tuc van thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((o hoi) or (o hai)). lieu ((va cau) or (van dau)) tuc van thanh vai cua tre*.