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

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 acceleration") OR ((("particle accelerators") OR ((("particle accelerated") OR ((("particles accelerated") OR ("parallel acceleration")))))))).
• Removing quotes may allow a broader search: (( particle acceleration ) or ((( particle accelerators ) or ((( particle accelerated ) or ((( particles accelerated ) or ( parallel acceleration )))))))).
• Adding a wildcard symbol may retrieve word variants: (("particle acceleration") or ((("particle accelerators") or ((("particle accelerated") or ((("particles accelerated") or ("parallel acceleration"))))))))*.