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