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 evidence." » "improving _ performance evidence.", "improving firms performance evidence.", "improving air performance evidence.", "improving birth performance evidence."

Try widening your search to All Fields.

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 metrics.") or ("improving firm performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving country performance metrics.") OR ("improving firm performance evidence.")).
• Removing quotes may allow a broader search: (( improving country performance metrics. ) or ( improving firm performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("improving country performance metrics.") or ("improving firm performance evidence."))*.