Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nay thuc » nam thuc, cay thuc, day thuc
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
lang ha » long ha
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cua triet, dua tren
va nay » va ngay, va cay
ha hoi » hoa hoi, ha noi, xa hoi

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: thuoc sach ky lang ha hoi. hieu va nay thuc ((va dao) OR (ca dao)) vai ((cuu tre) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky lang ha hoi. hieu va nay thuc ((va dao) or (ca dao)) vai ((cuu tre) OR (cua tre))~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky lang ha hoi. hieu va nay thuc ((va dao) or (ca dao)) vai ((cuu tre) OR (cua tre))*.