Perhaps you should try some spelling variations:
"improving human performance reviews." » "improving human performance review.", "improving human performance reports.", "improving human performance risks.", "improving loan performance reviews.", "improving thermal performance reviews.", "improving company performance reviews.", "improving urban performance reviews.", "improving rural performance reviews."
"improving bank performance series." » "improving bank performance metrics.", "improving bank performance review.", "improving bank performance targets.", "improving market performance series.", "improving _ performance series.", "improving firm performance series.", "improving land performance series.", "improving urban performance series.", "improving basic performance series."

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

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