Perhaps you should try some spelling variations:
"improve maternal performance contracts." » "improve materials performance contracts.", "improve external performance contracts.", "improve national performance contracts.", "improving maternal performance contracts.", "improve water performance contracts."
"improving country performance metrics." » "improving country performance measures.", "improving voluntary performance metrics.", "importing country performance metrics.", "improving community performance metrics."

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