Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu van » thien van, lieu va, hieu ve
cac luc » cau luc, coc luc, cac nuoc
cua tre » cuu tre, cua triet, dua tren
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
luc va » duc va, tuc va, loc va
sac ly » sac ky
va xay » va xac
cua te » cua tu

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