Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
anh via » anh bia, anh viet, anh giao
cua tre » cua te, cuu tre, cua triet
cac lo » cac lop, cac co, cac ho
cac bo » bac bo, cac co
anh va » hanh va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky tang xa hoi. lieu va ((cac lo) or (cac bo)) van ((anh via) OR (anh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang xa hoi. lieu va ((cac lo) OR (cac bo)) van ((anh via) OR (anh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang xa hoi. lieu va ((cac lo) or (cac bo)) van ((anh via) OR (anh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang xa hoi. lieu va ((cac lo) or (cac bo)) van ((anh via) OR (anh va)) cua tre*.