Perhaps you should try some spelling variations:
"particle acceleratorss" » "particle accelerators", "particle accelerations", "particle acceleraton", "particle acceleratorsss"
"particle acceleration" » "particle accelerators"
"particle accelerator" » "particle accelerators"

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