Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach kho » bach khoa, sach dao, sach nha
kho tang » cao tang
cua tre » cua te, cua triet, dua tren
anh dao » lanh dao, hanh dao, anh dat
van anh » van thanh, tuan anh, van minh
cuu tre » cau tren, cau treo
cac luc » cau luc, cac nuoc, cac cuoc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa

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 kho tang xa hoi. hieu va ((cac luc) OR (coc luc)) van anh dao ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach kho tang xa hoi. hieu va ((cac luc) OR (coc luc)) van anh dao ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach kho tang xa hoi. hieu va ((cac luc) OR (coc luc)) van anh dao ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach kho tang xa hoi. hieu va ((cac luc) OR (coc luc)) van anh dao ((cua tre) or (cuu tre))*.