Perhaps you should try some spelling variations:
"improving company performance contracts." » "improving country performance contracts.", "improve company performance contracts.", "improving compliance performance contracts.", "improving community performance contracts."
"improving school performance measures." » "improving schools performance measures.", "improving preschool performance measures.", "improve school performance measures."

Try widening your search to All Fields.

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