Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
thuc ca » thuc cua, thuc can, thuc cao
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
lang xa » lang ha, lang van
cuu tre » cua tre, cau tren, cau treo
ca dan » cac dan, ca dao
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (dang xay)) hoi. ((hieu va) OR (lieu va)) nam thuc ca dan va cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((lang xa) OR (dang xay)) hoi. ((hieu va) or (lieu va)) nam thuc ca dan va cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) OR (dang xay)) hoi. ((hieu va) or (lieu va)) nam thuc ca dan va cuu tre*.