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
sach ly » sach y, sach lo, sach ty
tuc van » thuc van, truc van, tuc va
van hau » van ha, van hai, van dau
cuu tre » cua tre, cau tren, cau treo
ly nang » ky nang, ly hang, ly vang
vi cuu » vi luu, vinh cuu
va cau » van cau, va cac, va dau
so ha » so hoa, so va
o hoi » co hoi, o hoc, o hai

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