Perhaps you should try some spelling variations:
"improving country performance metrics." » "improving country performance contracts.", "improving country performance measures.", "improving country performance contract.", "improving voluntary performance metrics.", "importing country performance metrics.", "borrowing country performance metrics."
"improving firm performance review." » "improving firm performance risk.", "improving firm performance evidence.", "improving _ performance review.", "improving firms performance review.", "improving air performance review.", "improving birth performance review."

Try widening your search to All Fields.

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