Perhaps you should try some spelling variations:
"improving thermal performance reviews." » "improving thermal performance review.", "improving thermal performance reports.", "improving thermal performance risks.", "improving maternal performance reviews.", "improving rural performance reviews.", "improving human performance reviews."
"improving loan performance measures." » "improving poor performance measures.", "improving bank performance measures.", "improving _ performance measures.", "improving local performance measures.", "improving land performance measures.", "improving road performance measures."

You may be able to get more results by adjusting your search query.

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