Perhaps you should try some spelling variations:
"Improving human performance metrics." » "Improving human performance contracts.", "Improving human performance measures.", "Improving human performance contract.", "Improving thermal performance metrics.", "Improving company performance metrics.", "Improving animal performance metrics."
"improving loan performance series." » "improving loan performance reviews.", "improving loan performance review.", "improving loan performance targets.", "improving poor performance series.", "improving bank performance series.", "improving _ performance series.", "improving local performance series.", "improving land performance series.", "improving road performance series."
improving human » improving urban, improving rural

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