Perhaps you should try some spelling variations:
"improving local performance metrics." » "improving local performance contracts.", "improving local performance measures.", "improving local performance contract.", "improving social performance metrics.", "improving loan performance metrics.", "improving fiscal performance metrics.", "improving global performance metrics."
"improving human performance series." » "improving human performance reviews.", "improving human performance review.", "improving human performance targets.", "improving loan performance series.", "improving thermal performance series.", "improving company performance series.", "improving urban performance series.", "improving rural performance series."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving human performance series.") or ("improving local performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance series.") OR ("improving local performance metrics.")).
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• Adding a wildcard symbol may retrieve word variants: (("improving human performance series.") or ("improving local performance metrics."))*.