Perhaps you should try some spelling variations:
"particle acceleration" » "particle accelerators"
"partially accelerated" » "partially integrated", "naturally accelerate", "partially degenerate"
"particle accelerator" » "particle accelerators"
"partially correlated" » "spatially correlated", "serially correlated", "partially connected"

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