Perhaps you should try some spelling variations:
"particle accelerating" » "particle accelerations", "particle acceleration", "particle acceleraton"
"particles accelerated" » "particles acceleration", "partially accelerated", "lattices accelerated"
"parallel acceleration" » "particle acceleration", "parallel generation", "parallel application"
"particle accelerator" » "particle acceleration"
"particle accelerators" » "particle accelerations", "particle accelerate"
"particle accelerated" » "particle acceleraton", "particle acceleration", "partially accelerated"

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