Perhaps you should try some spelling variations:
"improving maternal performance contract." » "improving materials performance contract.", "improving external performance contract.", "improving national performance contract.", "improving maternal performance contracts.", "improve maternal performance contract.", "improving water performance contract."
"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 ("improving maternal performance contract."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving country performance metrics.\") OR (\"improving maternal performance contract.\"))".
• Removing quotes may allow a broader search: (( improving country performance metrics. ) OR ( improving maternal performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving country performance metrics.") OR ("improving maternal performance contract."))*.