Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
xang ma » tang ma, nang ma, sang ma
hieu va » hieu qua
cac toc » cac toi, cac nuoc, cac thoi
cuu tre » cua tre, cau tren, cau treo
toc ca » toc cao, toc ta, toc co
va cuu » va cau, va chu, va huu
ca do » ca dao, cau do, cap do
do va » do van

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 ty xang ma hoa. ((hieu va) or (lieu va)) cac toc ca do va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty xang ma hoa. ((hieu va) OR (lieu va)) cac toc ca do va cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty xang ma hoa. ((hieu va) or (lieu va)) cac toc ca do va cuu tre*.