Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
danh dau » lanh dao, hang dau, danh tu
su sach » so sach, vu sach
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van 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: ((su sach) OR (so sanh)) v nang xa hoi. hieu va cac thuc va danh dau cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) v nang xa hoi. hieu va cac thuc va danh dau cua tre*.