Perhaps you should try some spelling variations:
"particle accelerator" » "particle acceleration", "pparticle acceleraton", "pparticle acceleration", "pparticelle acceleratori"
"particle accelerators" » "particle accelerations", "pparticle acceleratons", "pparticle accelerations", "pparticelle acceleratoris", "particle accelerated", "particle acceleration", "particle accelerate"
"article accelerator" » "particle acceleraton", "particle acceleration", "particelle acceleratori"

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