Perhaps you should try some spelling variations:
vpython collisions » vpython colisoes (Expand search), proton collisions (Expand search), photon collisions (Expand search)
decrease training » increased training (Expand search), disease training (Expand search), release training (Expand search)
collisions python » collisions within (Expand search), collisions with (Expand search), collisions on (Expand search)
code decrease » oxide decrease (Expand search), roads decrease (Expand search), to decrease (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
code code » code cdc (Expand search)

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

• Removing quotes may allow a broader search: (( code code decrease training program ) OR ( vpython collisions python python programming ))~.