Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
xuc ban » duc ban, cuc ban, quoc ban
xuc van » duc van, luc van, vuc van
van hac » van hoc, van ha, van hai
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
anh ca » danh ca, anh cam, anh cua
ca cua » co cua

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 ky nang ((ma hoi) OR (xa hoi)). hieu van hac ((xuc van) OR (xuc ban)) anh ca cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (xa hoi)). hieu van hac ((xuc van) or (xuc ban)) anh ca cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu van hac ((xuc van) or (xuc ban)) anh ca cua tre*.