Perhaps you should try some spelling variations:
"improving rural performance metrics." » "improving rural performance contracts.", "improving rural performance measures.", "improving rural performance contract.", "improving pupil performance metrics.", "improving thermal performance metrics.", "improving overall performance metrics.", "improving urban performance metrics.", "improving social performance metrics."
"improve basic performance series." » "improve basic performance reviews.", "improve basic performance review.", "improve basic performance targets.", "improve based performance series.", "improve bank performance series.", "improve past performance series."

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