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