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