Perhaps you should try some spelling variations:
"particle accelerations" » "particle accelerators", "particles acceleration", "particle concentrations", "particle acceleratorss"
"particle acceleration" » "particle accelerators"
"partially accelerated" » "partially correlated", "partially integrated", "naturally accelerate"
"particle accelerator" » "particle accelerators"
"particle accelerated" » "particles accelerated", "particle accelerators", "particles acceleration"
"practice accelerated" » "practice accelerate", "practices accelerate", "practices accelerating"
"particle acceleraton" » "particles acceleration", "pareticle acceleration", "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 accelerations") OR ((((((((("particle accelerated") OR ("practice accelerated"))) OR ("particle acceleration"))) OR ("partially accelerated"))) OR ("particle acceleraton")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"particle accelerator\") or (((\"particle accelerations\") or (((((((((\"particle accelerated\") OR (\"practice accelerated\"))) or (\"particle acceleration\"))) or (\"partially accelerated\"))) or (\"particle acceleraton\"))))))".
• Removing quotes may allow a broader search: (( particle accelerator ) or ((( particle accelerations ) or ((((((((( particle accelerated ) OR ( practice accelerated ))) or ( particle acceleration ))) or ( partially accelerated ))) or ( particle acceleraton )))))).
• Adding a wildcard symbol may retrieve word variants: (("particle accelerator") or ((("particle accelerations") or ((((((((("particle accelerated") OR ("practice accelerated"))) or ("particle acceleration"))) or ("partially accelerated"))) or ("particle acceleraton"))))))*.