Perhaps you should try some spelling variations:
"improving co performance metrics." » "improving co performance measures.", "improving ceo performance metrics.", "improving do performance metrics.", "improving core performance metrics.", "improving eco performance metrics.", "improving crop performance metrics.", "improving ict performance metrics."
"improving poor performance reviews." » "improving poor performance review.", "improving poor performance reports.", "improving poor performance risks.", "improving sector performance reviews.", "improving power performance reviews.", "improving food performance reviews.", "improving peer performance reviews."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving poor performance reviews.") or ("improving co performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving poor performance reviews.") OR ("improving co performance metrics.")).
• Removing quotes may allow a broader search: (( improving poor performance reviews. ) or ( improving co performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (("improving poor performance reviews.") or ("improving co performance metrics."))*.