Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
day dao » dan dao, day dan, day danh
hieu va » hieu qua
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
cuu tre » cua tre, cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi
dao va » dao van, tao va, do 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) OR (hoc sach)) ky lang ha hoi. ((hieu va) or (lieu va)) nam thuc day dao va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky lang ha hoi. ((hieu va) OR (lieu va)) nam thuc day dao va cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky lang ha hoi. ((hieu va) or (lieu va)) nam thuc day dao va cuu tre*".