Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
tu sach » thu sach, su sach, te sach
duc ban » duc van, dua ban, duc man
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
anh ve » anh va, anh viet, thanh ve
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 y nang x hoi. hieu van cham ((duc ban) or (duc tan)) ((anh ve) or (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu van cham ((duc ban) OR (duc tan)) ((anh ve) OR (hanh ve)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van cham ((duc ban) or (duc tan)) ((anh ve) or (hanh ve)) cua tre*.