Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » vu sach
cua tre » cua te, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
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 sach)) y nang xa hoi. hieu van cac tuc va danh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang xa hoi. hieu van cac tuc va danh vi ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang xa hoi. hieu van cac tuc va danh vi ((cua tre) OR (cuu tre))*.