Perhaps you should try some spelling variations:
"particles acceleration" » "particle accelerators", "parallel acceleration", "particles application"
"particle acceleration" » "particle accelerators"
"particle accelerating" » "particle accelerations", "particle acceleraton", "pareticle acceleration"
"particle accelerator" » "particle accelerators"
"parallel operation" » "parallel generation", "parallel computation", "parallel repetition"

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