Perhaps you should try some spelling variations:
"improve contract performance metrics." » "improve country performance metrics.", "improve court performance metrics.", "improve economic performance metrics.", "improve contract performance measures.", "improve contrast performance metrics.", "improve content performance metrics.", "improved control performance metrics."
"improving bank performance series." » "improving bank performance studies.", "improving bank performance size.", "improving urban performance series.", "improving basic performance series.", "improving brain 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 contract performance metrics.") or ("improving bank performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improve contract performance metrics.") OR ("improving bank performance series.")).
• Removing quotes may allow a broader search: (( improve contract performance metrics. ) or ( improving bank performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improve contract performance metrics.") or ("improving bank performance series."))*.