Perhaps you should try some spelling variations:
"improving crop performance reports." » "improving crop performance measures.", "improving poor performance reports.", "improving job performance reports.", "improving city performance reports.", "improving co performance reports.", "improving macro performance reports.", "improving food performance reports."
"improving urban performance risks." » "improving bank performance risks.", "improving loan performance risks.", "improving can performance risks.", "improving urban performance risk.", "improving urban performance issues.", "improving urban performance based."

Try widening your search to All Fields.

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