Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
cuu tre » cua tre, cau tren
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
van cac » van hac, van cau, van bac
xay hoi » tay hoi, cay phoi, gay thoi
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
tu sac » tu sach, tu cac, tu san
ky va » ly va, ke va, my va

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: tu sac ky va ((xay hoi) OR (xa hoi)). hieu van cac luc va hanh vai ((cuu tre) OR (cau treo))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky va ((xay hoi) OR (xa hoi)). hieu van cac luc va hanh vai ((cuu tre) or (cau treo))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky va ((xay hoi) OR (xa hoi)). hieu van cac luc va hanh vai ((cuu tre) or (cau treo))*.