Perhaps you should try some spelling variations:
"improving thermal performance studies." » "improving thermal performance audits.", "improving thermal performance audit.", "improving thermal performance standards.", "improving external performance studies.", "improving animal performance studies.", "improving erm performance studies."
"improving social performance reviews." » "improving social performance review.", "improving social performance reports.", "improving social performance risks.", "improving school performance reviews.", "improving fiscal performance reviews.", "improving financial performance reviews."

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