Perhaps you should try some spelling variations:
"parallel acceleration" » "particle acceleration", "parallel generation", "parallel application"
"particle acceleraton" » "particle acceleration", "particles acceleration", "particle accelerations"
"particle accelerator" » "particle acceleration"
"particle accelerators" » "particle accelerations", "particle accelerated", "particle accelerating"
"particle accelerate" » "particles accelerated", "particle acceleration", "practice accelerate"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("particle accelerate") OR ("particle acceleraton"))) OR ((("particle accelerator") OR ((("particle accelerators") OR ("parallel acceleration")))))).
• Removing quotes may allow a broader search: (((( particle accelerate ) or ( particle acceleraton ))) or ((( particle accelerator ) or ((( particle accelerators ) or ( parallel acceleration )))))).
• Adding a wildcard symbol may retrieve word variants: (((("particle accelerate") or ("particle acceleraton"))) or ((("particle accelerator") or ((("particle accelerators") or ("parallel acceleration"))))))*.