Perhaps you should try some spelling variations:
vpython collisions » vpython colisoes (Expand search), proton collisions (Expand search), photon collisions (Expand search)
defense processes » defense process (Expand search), decrease processes (Expand search), disease processes (Expand search)
decrease defense » defense defense (Expand search), decrease release (Expand search), decreases disease (Expand search)
collisions via » collisions in (Expand search), collisions with (Expand search), collisions at (Expand search)
decrease fear » decrease after (Expand search), decrease their (Expand search), decrease cell (Expand search)
fear decrease » break decrease (Expand search), merr decreases (Expand search), can decrease (Expand search)
via python » in python (Expand search)

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

• Removing quotes may allow a broader search: (( decrease fear decrease defense processes ) OR ( vpython collisions via python programming ))~.