Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
danh vi » hanh vi, dinh vi, danh va
danh di » danh du, xanh di, danh dien
cuu tre » cua tre, cau tren, cau treo
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, may nang

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 ((y nang) OR (v nang)) ma hoa. hieu va cam thuc va ((danh vi) OR (danh di)) cuu tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (v nang)) ma hoa. hieu va cam thuc va ((danh vi) or (danh di)) cuu tre*.