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