Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cuc ban » cua ban, cuu ban, duc ban
cac ban » cac dan, cac van, can ban
hanh de » hanh ve, hanh kem
cuu tre » cua tre, cau tren, cau treo
de cuu » de cua
x hoi » o 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: tu sach ky nang ((x hoi) OR (xa hoi)). hieu qua pham ((cuc ban) OR (cac ban)) hanh de cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) or (xa hoi)). hieu qua pham ((cuc ban) OR (cac ban)) hanh de cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (xa hoi)). hieu qua pham ((cuc ban) OR (cac ban)) hanh de cuu tre*.