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