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 chain performance reviews."
"Improving human performance contracts." » "Improving loan performance contracts.", "Improving thermal performance contracts.", "Improving chain performance contracts."

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 contracts.") OR ("improving human performance reviews."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Improving human performance contracts.\") OR (\"improving human performance reviews.\"))".
• Removing quotes may allow a broader search: (( Improving human performance contracts. ) OR ( improving human performance reviews. )).
• Adding a wildcard symbol may retrieve word variants: (("Improving human performance contracts.") OR ("improving human performance reviews."))*.