Perhaps you should try some spelling variations:
"particle accelerations" » "particle accelerators", "particle accelerator", "particle concentrations", "particle acceleratorss"
"particles acceleration" » "particle accelerator", "particle accelerators", "parallel acceleration"
"particle acceleration" » "particle accelerators"
"partially accelerated" » "particle accelerator", "partially correlated", "partially integrated"
"particle accelerated" » "particles accelerated", "particle accelerator", "particle accelerators"
"particle acceleraton" » "particle accelerator", "pareticle acceleration", "particle accelerators"

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 acceleration") OR ((("particle accelerations") OR ((((("particle accelerated") OR ("partially accelerated"))) OR ((("particle acceleraton") OR ("particles acceleration")))))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"particle acceleration\") or (((\"particle accelerations\") or (((((\"particle accelerated\") or (\"partially accelerated\"))) or (((\"particle acceleraton\") OR (\"particles acceleration\"))))))))".
• Removing quotes may allow a broader search: (( particle acceleration ) or ((( particle accelerations ) or ((((( particle accelerated ) or ( partially accelerated ))) or ((( particle acceleraton ) OR ( particles acceleration )))))))).
• Adding a wildcard symbol may retrieve word variants: (("particle acceleration") or ((("particle accelerations") or ((((("particle accelerated") or ("partially accelerated"))) or ((("particle acceleraton") OR ("particles acceleration"))))))))*.