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