Perhaps you should try some spelling variations:
"particles acceleration" » "particle acceleration", "particle accelerator", "parallel acceleration"
"particle accelerating" » "particle accelerations", "particle acceleration", "pareticle acceleration"
"particle acceleraton" » "particle acceleration", "particle accelerator", "particle accelerations"
"particle accelerators" » "particle accelerator", "particle accelerated", "particle accelerate"

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