Perhaps you should try some spelling variations:
"improving human performance review." » "improving human performance risk.", "improving human performance evidence.", "improving loan performance review.", "improving company performance review.", "improving animal performance review.", "improving urban performance review.", "improving rural performance review."
"improving thermal performance targets." » "improving maternal performance targets.", "improving rural performance targets.", "improving mental performance targets."

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