Perhaps you should try some spelling variations:
"pparticle accelerator" » "particle accelerator", "particle acceleraton", "particle acceleration"
"article accelerators" » "particle accelerator", "particle accelerations", "particle acceleraton"
"particle accelerators" » "pparticle accelerator", "pparticle accelerations", "pparticle acceleraton"

Try widening your search to All Fields.

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