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 bond performance risk." » "improving board performance risk.", "improving fund performance risk.", "improving good performance risk.", "improving bond performance 2019.", "improving blood performance risk.", "improving food performance risk.", "improving beef performance risk."

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