Perhaps you should try some spelling variations:
"improving equity performance series." » "improving equity performance studies.", "improving equity performance size.", "improving security performance series.", "improving quality performance series.", "improving city performance series.", "improving energy 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 equity performance series.") or ("improving country performance review."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving equity performance series.") OR ("improving country performance review.")).
• Removing quotes may allow a broader search: (( improving equity performance series. ) or ( improving country performance review. )).
• Adding a wildcard symbol may retrieve word variants: (("improving equity performance series.") or ("improving country performance review."))*.