Perhaps you should try some spelling variations:
"pparticle accelerator" » "particle acceleraton", "particle acceleration", "particelle acceleratori", "pparticle acceleration"
"particle accelerators" » "particle accelerations", "particle accelerated", "particle accelerate", "particle acceleration"
"particle accelerator" » "particle acceleration"

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