Section 156(3) of IPC

i have filed a criminal complaint under metropolitan magistrate in dwarka court delhi under section 420,467,468,406,471/34 of i.p.c. accompanied with application under section 156(3)c.r.p.c against the accused who sold the same property which was already sold to me by their father through irrecovable gpa with consideration. after their father's death in mutation the property came on their lr's name which they sold to other person knowing i m the owner but the problem is sir court has not filed case against purchaser of the plot but only seller are filed under section 467 and 34 why court has not filed case against purchaser and how to involve they in the criminal case..bcoz in real picture of this case all 4 have planned and executed sell-deed in their favour..on my plot fencing was done,gate was installed, name plate was as there, they know everything about the plot they i m the owner. what i can do against purchaser