Perhaps you should try some spelling variations:
"improve community performance series." » "improve country performance series.", "improve company performance series.", "improve commercial performance series.", "improve community performance studies.", "improve community performance size.", "improving community performance series.", "impact community performance series."
"improving team performance evidence." » "improving firm performance evidence.", "improving teacher performance evidence.", "improving thermal performance evidence.", "improving tax performance evidence.", "improving eap performance evidence.", "improving erm performance evidence."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("improve community performance series.") or ("improving team performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improve community performance series.") OR ("improving team performance evidence.")).
• Removing quotes may allow a broader search: (( improve community performance series. ) or ( improving team performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("improve community performance series.") or ("improving team performance evidence."))*.