Perhaps you should try some spelling variations:
phap duc » pham duc, phan duc, phap doc
qua phap » quan phap, cua phap, qua phan
hanh de » hanh ve, hanh kem
duc ban » duc tan, duc van, dua ban
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
anh de » anh d, anh ve, anh du
o hai » co hai, so hai, o lai
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: tu sach ky nang ((x hoi) or (o hai)). hieu qua phap duc ban ((anh de) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (o hai)). hieu qua phap duc ban ((anh de) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (o hai)). hieu qua phap duc ban ((anh de) or (hanh de)) cua tre*.