Perhaps you should try some spelling variations:
"improving loan performance series." » "improving loan performance studies.", "improving loan performance size.", "improving local performance series.", "improving land performance series.", "improving lead performance series."
"improving gender performance series." » "improving gender performance studies.", "improving gender performance size.", "improving gendered performance series.", "improving center performance series.", "improving under performance series.", "improving energy performance series."

Try widening your search to All Fields.

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