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 power performance measures." » "improving poor performance measures.", "improving worker performance measures.", "improving core performance measures.", "improving peer performance measures.", "improving sewer 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 power performance measures."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving thermal performance reviews.") OR ("improving power performance measures.")).
• Removing quotes may allow a broader search: (( improving thermal performance reviews. ) or ( improving power performance measures. )).
• Adding a wildcard symbol may retrieve word variants: (("improving thermal performance reviews.") or ("improving power performance measures."))*.