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