Perhaps you should try some spelling variations:
"partially accelerated" » "particle accelerator", "partially correlated", "partially averaged"
"particle accelerated" » "particles accelerated", "particle accelerator", "practice accelerated"
"naturally accelerate" » "naturally regenerated"
"partially integrated" » "vertically integrated", "partially saturated", "fractionally integrated"
"particle acceleraton" » "particle accelerator", "particles acceleration", "particle accelerations"
"particle accelerators" » "particle accelerator", "particle accelerating"

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