Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, cua triet
x hoi » x ho, 5 hoi
o hoi » co hoi, o hoc, o hai
d cua » de cua, do cua, da cua

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 (o hoi))) or (xa hoi)). hieu qua cham duc ban anh d cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((x hoi) OR (o hoi))) OR (xa hoi)). hieu qua cham duc ban anh d cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((((x hoi) OR (o hoi))) or (xa hoi)). hieu qua cham duc ban anh d cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((x hoi) OR (o hoi))) or (xa hoi)). hieu qua cham duc ban anh d cua tre*.