Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham cuc » cham cuu, pham cuc, pham chuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cuc ban » cua ban, cac ban, cuu ban
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
anh de » anh d, anh ve, anh du
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. hieu van cham cuc 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. hieu van cham cuc ban ((anh de) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van cham cuc ban ((anh de) or (hanh de)) cua tre*.