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