Perhaps you should try some spelling variations:
photon collisions » proton collisions (Expand search), proton collision (Expand search), ion collisions (Expand search)
collisions python » collisions within (Expand search), collisions with (Expand search), collisions on (Expand search)
decrease basic » disease basic (Expand search), decrease asian (Expand search), decreased base (Expand search)
basic programa » basico programa (Expand search), brasil programa (Expand search), fisica programa (Expand search)
decrease with » decreases with (Expand search), increase with (Expand search), decrease in (Expand search)
with decrease » with decreased (Expand search), with deceased (Expand search), with increase (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)

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

• Removing quotes may allow a broader search: (( decrease with decrease basic programa ) OR ( photon collisions python python programming ))~.