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 based.", "improving thermal performance _."
"improving loan performance measures." » "improving poor performance measures.", "improving bank performance measures.", "improving _ performance measures.", "improving local performance measures.", "improving land performance measures.", "improving road performance measures."

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