Perhaps you should try some spelling variations:
"improving thermal performance reviews." » "improving thermal performance review.", "improving thermal performance reports.", "improving thermal performance risks.", "improving external performance reviews.", "improving animal performance reviews.", "improving erm performance reviews."
"improving loan performance reviews." » "improving loan performance review.", "improving loan performance reports.", "improving loan performance risks.", "improving local performance reviews.", "improving land performance reviews.", "improving lead performance reviews."

Try widening your search to All Fields.

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