Perhaps you should try some spelling variations:
"particle acceleration" » "particle accelerators"
"partially accelerated" » "partially correlated", "partially integrated", "naturally accelerate"
"particles accelerated" » "particles acceleration", "lattices accelerated", "particle acceleraton"
"particle accelerator" » "particle accelerators"

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 ("particles accelerated")))))).
• Removing quotes may allow a broader search: (( particle accelerator ) or ((( particle acceleration ) or ((( partially accelerated ) or ( particles accelerated )))))).
• Adding a wildcard symbol may retrieve word variants: (("particle accelerator") or ((("particle acceleration") or ((("partially accelerated") or ("particles accelerated"))))))*.