Perhaps you should try some spelling variations:
"Improving human performance results." » "Improving human performance reports.", "Improving human performance measures.", "Improving human performance report.", "Improving loan performance results.", "Improving thermal performance results.", "Improving chain performance results."
"improving human performance risks." » "improving loan performance risks.", "improving thermal performance risks.", "improving chain performance risks.", "improving human performance risk."

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 results.") or ("improving human performance risks."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("Improving human performance results.") OR ("improving human performance risks.")).
• Removing quotes may allow a broader search: (( Improving human performance results. ) or ( improving human performance risks. )).
• Adding a wildcard symbol may retrieve word variants: (("Improving human performance results.") or ("improving human performance risks."))*.