Perhaps you should try some spelling variations:
"improving outdoor performance series." » "improving outdoor performances series.", "improving outcomes performance series.", "improving poor performance series.", "improving outdoor performance studies.", "improving outdoor performance size.", "improving indoor performance series.", "improving our performance series."
"improving country performance review." » "improving country performance risk.", "improving country performance evidence.", "improving voluntary performance review.", "importing country performance review.", "improving community performance review."

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

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