Perhaps you should try some spelling variations:
"Improving company performance measures." » "Improving country performance measures.", "Improving loan performance measures.", "Improving corporate performance measures."
"improving human performance series." » "improving human performance metrics.", "improving human performance reviews.", "improving human performance review.", "improving loan performance series.", "improving thermal performance series.", "improving animal performance series.", "improving urban performance series.", "improving rural 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 human performance series.") or ("Improving company performance measures."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance series.") OR ("Improving company performance measures.")).
• Removing quotes may allow a broader search: (( improving human performance series. ) or ( Improving company performance measures. )).
• Adding a wildcard symbol may retrieve word variants: (("improving human performance series.") or ("Improving company performance measures."))*.