We design a two-stage mechanism for more efficient and practical heterogeneous goods sale operations,which first implements VCG combinatorial auction then price bargaining.Specifically,a difference between one-unit auction and combinatorial auction is existence of different types in winner bidders: 4 types in our mechanism.We show that,the auction stage keeps incentive compatible property in VCG.The five types of winner bidders can be divided into two groups,i.e.,"1st class bidders" and "2nd cla...