Perhaps you should try some spelling variations:
ban hanh » ban hang
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
cham so » cham soc, ham so, cham hoi
hieu ve » hieu va, hieu van
cham o » cham soc
ma hoi » mai hoi, xa hoi, ma hoa

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 cac ky tang ma hoi. hieu ve ((cham so) OR (cham o)) ban hanh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky tang ma hoi. hieu ve ((cham so) or (cham o)) ban hanh vi ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang ma hoi. hieu ve ((cham so) or (cham o)) ban hanh vi ((cua tre) OR (cuu tre))*.