Perhaps you should try some spelling variations:
"pparticelle acceleratori" » "particelle acceleratori", "particle accelerators", "particle accelerator"
"particle accelerated" » "particles accelerated", "particle accelerator", "particle acceleraton"
"article accelerator" » "particle accelerator", "particle accelerators", "particle acceleraton"

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