Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
day dan » day danh, dao dan, cay dan
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. ((((hieu va) or (hieu qua))) or (lieu va)) nam thuc day dan va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. ((((hieu va) OR (hieu qua))) OR (lieu va)) nam thuc day dan va cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. ((((hieu va) or (hieu qua))) or (lieu va)) nam thuc day dan va cuu tre*.