Perhaps you should try some spelling variations:
qua cham » qua cac, va cham, qua cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
qua hai » qua hoat
cuc ban » cua ban, cac ban, cuu ban
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, cua triet
anh te » anh tu, anh ta, anh ve
te cua » tue cua, le cua, de cua
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((x hoi) or (xa hoi)). hieu ((qua cham) OR (qua hai)) cuc ban anh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (xa hoi)). hieu ((qua cham) OR (qua hai)) cuc ban anh te cua 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 cham) OR (qua hai)) cuc ban anh te cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (xa hoi)). hieu ((qua cham) OR (qua hai)) cuc ban anh te cua tre*.