Perhaps you should try some spelling variations:
"particle accelerator" » "article accelerator", "particle accelerate", "particle accelerating"
"particle accelerations" » "article accelerations", "particle accelerating", "particle accelerators", "particle accelerates"
"particles accelerated" » "articles accelerated"
"particles acceleration" » "articles acceleration", "particles accelerate"
"partially accelerated" » "partial accelerated"
"pareticle acceleration" » "pareticle accelerate", "partticle acceleration", "paretische acceleration", "article 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 ((("particle accelerations") OR ((((("particles accelerated") OR ("partially accelerated"))) OR ((("particles acceleration") OR ("pareticle acceleration")))))))).
• Removing quotes may allow a broader search: (( particle accelerator ) or ((( particle accelerations ) or ((((( particles accelerated ) or ( partially accelerated ))) or ((( particles acceleration ) or ( pareticle acceleration )))))))).
• Adding a wildcard symbol may retrieve word variants: (("particle accelerator") or ((("particle accelerations") or ((((("particles accelerated") or ("partially accelerated"))) or ((("particles acceleration") or ("pareticle acceleration"))))))))*.