Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
tuc van » thuc van, truc van, tuc va
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
vi cua » vai cua, di cua
va cau » va cac, va dau, va cao
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 ky nang ((o hoi) or (o hai)). lieu ((va cau) or (van cau)) tuc van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((o hoi) OR (o hai)). lieu ((va cau) OR (van cau)) tuc van thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) or (o hai)). lieu ((va cau) or (van cau)) tuc van thanh vi cua tre*.