Perhaps you should try some spelling variations:
"improving contract performance metrics." » "improving country performance metrics.", "improving court performance metrics.", "improving corporate performance metrics.", "improving contract performance contracts.", "improving contract performance measures.", "improving contract performance contract.", "improve contract performance metrics.", "improving central performance metrics.", "improving coverage performance metrics."
"improving basic performance series." » "improving basic performance reviews.", "improving basic performance review.", "improving basic performance targets.", "improving based performance series.", "improving bank performance series.", "improving past performance series.", "improving air performance series.", "improve basic performance series.", "improving public 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: (("improving contract performance metrics.") or ("improving basic performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving contract performance metrics.") OR ("improving basic performance series.")).
• Removing quotes may allow a broader search: (( improving contract performance metrics. ) or ( improving basic performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving contract performance metrics.") or ("improving basic performance series."))*.