Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc van » thuc vat, thuc dan, thuc va
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
dinh ve » dinh ket, dinh van
dinh vi » dinh viet, dinh tri, dinh thi
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet

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