Perhaps you should try some spelling variations:
"particle accelerating" » "particle accelerations", "particles acceleration", "pareticle acceleration"
"particles accelerated" » "particles acceleration", "particle accelerator", "partially accelerated"
"particle accelerated" » "particle accelerator", "partially accelerated", "practice accelerated"
"particle acceleraton" » "particle accelerator", "particles acceleration", "particle accelerations"
"particle accelerators" » "particle accelerator", "particle accelerate"

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 accelerating"))) OR ((((("particle accelerated") OR ("particle acceleraton"))) OR ("particles accelerated")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"particle acceleration\") or (((((\"particle accelerators\") OR (\"particle accelerating\"))) or (((((\"particle accelerated\") or (\"particle acceleraton\"))) or (\"particles accelerated\"))))))".
• Removing quotes may allow a broader search: (( particle acceleration ) or ((((( particle accelerators ) OR ( particle accelerating ))) or ((((( particle accelerated ) or ( particle acceleraton ))) or ( particles accelerated )))))).
• Adding a wildcard symbol may retrieve word variants: (("particle acceleration") or ((((("particle accelerators") OR ("particle accelerating"))) or ((((("particle accelerated") or ("particle acceleraton"))) or ("particles accelerated"))))))*.