Perhaps you should try some spelling variations:
danh dau » lanh dao, hang dau, danh tu
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
dau cua » dai cua, day cua, cau cua
thuc va » thuc vat, thuc day
van cac » van hac, van cau, van bac
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v 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)) y nang xa hoi. hieu van cac ((thuc va) OR (thuc dan)) danh dau cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) y nang xa hoi. hieu van cac ((thuc va) OR (thuc dan)) danh dau cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang xa hoi. hieu van cac ((thuc va) OR (thuc dan)) danh dau cua tre*.