Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham duc » pham duc, cham soc, pham duy
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
vi cua » di cua
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh ((vi cua) or (vai cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh ((vi cua) OR (vai cua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh ((vi cua) or (vai cua)) vat".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((ma hoi) OR (mai hoi)). hieu ve cham duc ban thanh ((vi cua) or (vai cua)) vat*.