Perhaps you should try some spelling variations:
"improving social performance series." » "improving school performance series.", "improving fiscal performance series.", "improving financial performance series.", "improving social performance metrics.", "improving social performance reviews.", "improving social performance targets."
"improving export performance review." » "improving export performance risk.", "improving export performance evidence.", "improving labor performance review.", "emerging export performance review.", "improving upper 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 social performance series.") or ("improving export performance review."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving social performance series.") OR ("improving export performance review.")).
• Removing quotes may allow a broader search: (( improving social performance series. ) or ( improving export performance review. )).
• Adding a wildcard symbol may retrieve word variants: (("improving social performance series.") or ("improving export performance review."))*.