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