Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
so sanh » do sanh
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh du » danh dau, danh tu, dinh du
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
du cua » duy cua, dau cua, dum cua
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 (ky nang)) x hoi. hieu va cac thuc va danh du cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ((y nang) OR (ky nang)) x hoi. hieu va cac thuc va danh du cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ((y nang) OR (ky nang)) x hoi. hieu va cac thuc va danh du cua tre*.