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