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