Perhaps you should try some spelling variations:
"particle accelerationd" » "particle accelerations", "particles acceleration", "pareticle acceleration", "particle acceleratorsd"
"partially accelerated" » "partially correlated", "partially integrated", "naturally accelerate"
"particle acceleration" » "particle accelerators"
"particle accelerator" » "particle accelerators"
"particle accelerated" » "particles accelerated", "particle acceleraton", "particle accelerators", "particles acceleratedd", "particle acceleratond", "particle acceleratorsd"
"particle accelerate" » "particles accelerated", "particle acceleraton", "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 ((("particle accelerate") OR ((((((("particle accelerated") OR ("particle accelerationd"))) OR ("partially accelerated"))) OR ("particle acceleration")))))).
• Removing quotes may allow a broader search: (( particle accelerator ) or ((( particle accelerate ) or ((((((( particle accelerated ) or ( particle accelerationd ))) or ( partially accelerated ))) or ( particle acceleration )))))).
• Adding a wildcard symbol may retrieve word variants: (("particle accelerator") or ((("particle accelerate") or ((((((("particle accelerated") or ("particle accelerationd"))) or ("partially accelerated"))) or ("particle acceleration"))))))*.