Perhaps you should try some spelling variations:
"improving social performance reviews." » "improving social performance review.", "improving social performance reports.", "improving social performance risks.", "improving school performance reviews.", "improving fiscal performance reviews.", "improving financial performance reviews."
"improving country performance risk." » "improving voluntary performance risk.", "importing country performance risk.", "improving community performance risk.", "improving country performance 2019."

Try widening your search to All Fields.

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