help regarding combinatorics
You say in a comment:


  I am interested in combination problems that contain-distribution of distinct/indistinct objects to distinct/indistinct people,also with type of partition not defined,unordered partition etc advanced level problems


It doesn't sound to me like you want a book that covers all of combinatorics. Combinatorics is a vast subject, which includes enumerative combinatorics, probabilistic combinatorics, extremal combinatorics, graph theory, and several other subdisciplines. It sounds to me like you are interested in a subarea of enumerative combinatorics.  

Richard Stanley's two-volume series on enumerative combinatorics is quite good, and I suspect it contains the material you want.