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