Perhaps you should try some spelling variations:
permutation based » perturbation based (Expand search), formulation based (Expand search), mutation based (Expand search)
cdc permutation » idle permutation (Expand search), _ permutation (Expand search), the permutation (Expand search)
based decrease » based increased (Expand search), faster decrease (Expand search), and decrease (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
in python » _ python (Expand search)
code cdc » code cpc (Expand search), code ctn (Expand search)

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

• Removing quotes may allow a broader search: (( code cdc permutation based decrease ) OR ( in python python python programming ))~.