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