Perhaps you should try some spelling variations:
"partially accelerated" » "partially correlated", "partially integrated", "partially degenerate"
"naturally accelerate" » "naturally regenerated"
"particle accelerators" » "particle accelerating"

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