Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
cuc ban » cua ban, cac ban, cuu ban
xuc ban » duc ban, quoc ban, xuat ban
van cam » van nam, van lam, van cau
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
anh te » anh tu, anh ta, anh ve
te cuu » te cua, te cau, tu cuu
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) OR (su sach)) ty nang x hoi. hieu van cam ((xuc ban) OR (cuc ban)) anh te cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang x hoi. hieu van cam ((xuc ban) or (cuc ban)) anh te cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang x hoi. hieu van cam ((xuc ban) or (cuc ban)) anh te cuu tre*.