Perhaps you should try some spelling variations:
"improving thermal performance risk." » "improving maternal performance risk.", "improving rural performance risk.", "improving human performance risk.", "improving thermal performance size.", "improving thermal performance _.", "improving thermal performance data."
"improving local performance based." » "improving social performance based.", "improving loan performance based.", "improving fiscal performance based.", "improving local performance measures.", "improving global performance based."

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