Perhaps you should try some spelling variations:
"partially accelerated" » "partially correlated", "partially integrated", "naturally accelerate"
"particle accelerated" » "particles accelerated", "particle acceleraton", "practice accelerated"
"particle accelerators" » "particle accelerate", "particle accelerating"

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