Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cuu tre, cua triet, dua tren
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
cua te » cua tu
y nang » ky nang, ly nang, v nang
cac tu » cac thu, cach tu, cac du
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 y nang x hoi. hieu van ((cac tu) OR (cac toc)) va dinh va ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu van ((cac tu) or (cac toc)) va dinh va ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van ((cac tu) or (cac toc)) va dinh va ((cua tre) OR (cua te))*.