Perhaps you should try some spelling variations:
"particle acceleraton" » "particle accelerator", "particles acceleration", "particle accelerations"
"particle accelerate" » "particles accelerated", "particle accelerator", "practice accelerate"
"particle accelerators" » "particle accelerator", "particle accelerated", "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 acceleraton"))) OR ("particle accelerate")))).
• Removing quotes may allow a broader search: (( particle acceleration ) or ((((( particle accelerators ) or ( particle acceleraton ))) or ( particle accelerate )))).
• Adding a wildcard symbol may retrieve word variants: (("particle acceleration") or ((((("particle accelerators") or ("particle acceleraton"))) or ("particle accelerate"))))*.