Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
van hanh » ban hanh, van anh, van ban
vu sach » vu bach, su sach, vu khach
xay hoi » xa hoi, tay hoi, gay thoi
van coc » van hoc, van loc, van co
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang

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: vu sach y dang ((xay hoi) OR (cay phoi)). hieu van coc luc ((van hanh) OR (van thanh)) tri cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y dang ((xay hoi) OR (cay phoi)). hieu van coc luc ((van hanh) or (van thanh)) tri cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach y dang ((xay hoi) OR (cay phoi)). hieu van coc luc ((van hanh) or (van thanh)) tri cua tre*.