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."
"improve company performance reviews." » "improve company performance review.", "improve company performance reports.", "improve company performance risks.", "improve country performance reviews."

Try widening your search to All Fields.

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