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