Perhaps you should try some spelling variations:
"improving overall performance contract." » "improving overall performance contracts.", "improving average performance contract.", "improving thermal performance contract.", "improving governance performance contract.", "improving coverage performance contract.", "improving rural performance contract.", "improving poverty performance contract."
"improving urban performance measures." » "improving bank performance measures.", "improving loan performance measures.", "improving can performance measures."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving overall performance contract.") or ("improving urban performance measures."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving overall performance contract.") OR ("improving urban performance measures.")).
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