Perhaps you should try some spelling variations:
"improving loan performance series." » "improving loan performance metrics.", "improving loan performance reviews.", "improving loan performance review.", "improving poor performance series.", "improving bank performance series.", "improving _ performance series.", "improving local performance series.", "improving land performance series.", "improving road performance series."
"improving co performance risk." » "improving co performance size.", "improving co performance based.", "improving co performance _.", "improving do performance risk.", "improving crop performance risk.", "improving job performance risk.", "improving _ performance risk.", "improving macro performance risk.", "improving food performance risk."

Try widening your search to All Fields.

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