Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
anh do » anh doc, anh d, anh co
do cua » doi cua, co cua, de cua
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ty nang o hai. lieu va cam ((xuc ban) or (duc ban)) anh do cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang o hai. lieu va cam ((xuc ban) OR (duc ban)) anh do cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang o hai. lieu va cam ((xuc ban) or (duc ban)) anh do cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang o hai. lieu va cam ((xuc ban) or (duc ban)) anh do cua tre*.