Perhaps you should try some spelling variations:
"article accelerators" » "particle accelerations", "particle acceleraton", "particelle acceleratori"
"particle accelerators" » "pparticle accelerations", "pparticle acceleraton", "pparticelle acceleratori", "particle accelerations"
"particle accelerator" » "particle 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: (("article accelerators") OR ((("particle accelerator") OR ("particle accelerators")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"article accelerators\") or (((\"particle accelerator\") OR (\"particle accelerators\"))))".
• Removing quotes may allow a broader search: (( article accelerators ) or ((( particle accelerator ) OR ( particle accelerators )))).
• Adding a wildcard symbol may retrieve word variants: (("article accelerators") or ((("particle accelerator") OR ("particle accelerators"))))*.