Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
hieu ve » hieu va, hieu van
cac luu » cac luat, sach luu
luu van » cuu van, luan van, luu hanh
cuu tre » cua tre, cau tren
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc
x hoi » xa hoi, o hoi, x ho

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: toc sach y nang ((x hoi) OR (o hoc)). hieu ve cac luu van hanh kem ((cuu tre) OR (cau treo))~.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((x hoi) or (o hoc)). hieu ve cac luu van hanh kem ((cuu tre) or (cau treo))*.