Perhaps you should try some spelling variations:
"particles acceleration" » "particle acceleration", "parallel acceleration", "particles application"
"partially accelerated" » "partially correlated", "naturally accelerate", "partially averaged"
"particle accelerator" » "particle acceleration"
"particle accelerators" » "particle accelerations", "particle accelerate", "particle accelerating"
"particle accelerated" » "particles accelerated", "particle acceleration", "practice accelerated"
"partially integrated" » "vertically integrated", "partially saturated", "fractionally integrated"
"particle acceleraton" » "particle acceleration", "particle accelerations", "pareticle acceleration"

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 accelerated") OR ((("partially accelerated") OR ("partially integrated"))))) 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 accelerated\") or (((\"partially accelerated\") OR (\"partially integrated\"))))) or (((\"particle acceleraton\") or (\"particles acceleration\"))))))))*".
• Removing quotes may allow a broader search: (( particle accelerator ) or ((( particle accelerators ) or ((((( particle accelerated ) or ((( partially accelerated ) OR ( partially integrated ))))) or ((( particle acceleraton ) or ( particles acceleration ))))))))*.