scheme for (something)
To form or contrive a secret or devious plan or conspiracy in order to obtain, achieve, or accomplish something. We spent the afternoon scheming for a way to get into the elite Hollywood party so we could meet some celebrities. I heard that he's been scheming for a new computer that he could charge to the company accounts.
scheme for something
to plot and plan for something, perhaps using deception. She is scheming for a raise. Ted is always scheming for a way to miss work.