Perhaps you should try some spelling variations:
"improving fiscal performance review." » "improving fiscal performance risk.", "improving fiscal performance evidence.", "improving financial performance review.", "improving firm performance review.", "improving social performance review.", "improving rural performance review."
"improving thermal performance series." » "improving thermal performance metrics.", "improving thermal performance reviews.", "improving thermal performance targets.", "improving maternal performance series.", "improving rural performance series.", "improving human performance series."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving fiscal performance review.") or ("improving thermal performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving fiscal performance review.") OR ("improving thermal performance series.")).
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