Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
tu sach » thu sach, su sach, te sach
cuc ban » cac ban, cuu ban, duc ban
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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.

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