Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
duc cua » doc cua, luc cua, tuc cua
anh duc » minh duc
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
so sanh » do sanh
y nang » ky nang, v nang, may nang
va anh » van anh, va danh, va hanh
x hoi » xa hoi, o hoi, x ho

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: ((su sach) OR (so sanh)) ((y nang) OR (ly nang)) x hoi. hieu va cac thuc va anh duc cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ((y nang) OR (ly nang)) x hoi. hieu va cac thuc va anh duc cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ((y nang) OR (ly nang)) x hoi. hieu va cac thuc va anh duc cua tre*.