Perhaps you should try some spelling variations:
thuat thuc » thuat thuy, thuyet thuc, thuc thuc
qua thuat » qua hoat, va thuat, qua nhat
thu sach » tu sach, thuat sach, thuoc sach
day danh » dai danh, dao danh, day dan
day manh » van manh, duc manh, ha manh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu qua thuat thuc ((day danh) or (day manh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu qua thuat thuc ((day danh) OR (day manh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu qua thuat thuc ((day danh) or (day manh)) dai cua tre*.