Perhaps you should try some spelling variations:
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
cua tre » cuu tre, cua triet, dua tren
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va cac, va co, va dao
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 ky nang ma hoi. hieu va cao duc va ((danh cho) OR (dan ca)) ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoi. hieu va cao duc va ((danh cho) or (dan ca)) ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu va cao duc va ((danh cho) or (dan ca)) ((cua tre) OR (cua te))*.