Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
va tinh » may tinh
va kinh » qua kinh
sach ky » sac ky, sach y, sach ty
nam xuc » cam xuc, nam xua, nam thuc
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (o hoi)). hieu van nam xuc ((va kinh) OR (va tinh)) va cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) OR (o hoi)). hieu van nam xuc ((va kinh) or (va tinh)) va cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) OR (o hoi)). hieu van nam xuc ((va kinh) or (va tinh)) va cuu tre*.