Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
ban hanh » ban hang
cau treo » cau theo, cau tren, cau triet
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
luc ban » duc ban, cuc ban, luc bat
cuu tre » cua tre, cau tren
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) y nang x hoi. hieu ve cac luc ban hanh kem ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang x hoi. hieu ve cac luc ban hanh kem ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y nang x hoi. hieu ve cac luc ban hanh kem ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) y nang x hoi. hieu ve cac luc ban hanh kem ((cuu tre) or (cau treo))*.