Perhaps you should try some spelling variations:
"learning community performance series." » "learning country performance series.", "learning company performance series.", "learning commercial performance series.", "learning communities performance series.", "mining community performance series.", "learning community performance studies.", "learning community performance size."
"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: (("learning community performance series.") or ("improving team performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning community performance series.") OR ("improving team performance evidence.")).
• Removing quotes may allow a broader search: (( learning community performance series. ) or ( improving team performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("learning community performance series.") or ("improving team performance evidence."))*.