Perhaps you should try some spelling variations:
"improving bank performance series." » "improving bank performance studies.", "improving bank performance size.", "improving urban performance series.", "improving basic performance series.", "improving brain performance series."
"improving macro performance risk." » "improving crop performance risk.", "improving ceo performance risk.", "improving machine performance risk.", "improving macro performance 2019.", "improving air performance risk.", "improving care performance risk.", "improving co performance risk."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving macro performance risk.") or ("improving bank performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving macro performance risk.") OR ("improving bank performance series.")).
• Removing quotes may allow a broader search: (( improving macro performance risk. ) or ( improving bank performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving macro performance risk.") or ("improving bank performance series."))*.