Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sang mai » sang ma, sang tai, lang mai
va thanh » gia thanh, va tinh, le thanh
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
ve cao » va cao, ve bao, ve cac

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 sang mai hoi. hieu ve cao duc ((va thanh) OR (ban thanh)) vai ((cuu tre) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky sang mai hoi. hieu ve cao duc ((va thanh) OR (ban thanh)) vai ((cuu tre) or (cua tre))~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky sang mai hoi. hieu ve cao duc ((va thanh) OR (ban thanh)) vai ((cuu tre) or (cua tre))*.