Perhaps you should try some spelling variations:
"improving national performance reviews." » "improving regional performance reviews.", "improving operational performance reviews.", "improving educational performance reviews.", "improving national performance review.", "improving national performance reports.", "improving national performance risks.", "improving maternal performance reviews.", "improving natural performance reviews.", "improve national performance reviews."
"improving water performance metrics." » "improving water performance measures.", "improving rate performance metrics.", "improving rated performance metrics.", "improving rates 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 water performance metrics.") OR ("improving national performance reviews."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving water performance metrics.\") OR (\"improving national performance reviews.\"))".
• Removing quotes may allow a broader search: (( improving water performance metrics. ) OR ( improving national performance reviews. )).
• Adding a wildcard symbol may retrieve word variants: (("improving water performance metrics.") OR ("improving national performance reviews."))*.