Perhaps you should try some spelling variations:
"improving maternal performance contracts." » "improving materials performance contracts.", "improving external performance contracts.", "improving national performance contracts.", "improve maternal performance contracts.", "improving water performance contracts."
"improving social performance targets." » "improving school performance targets.", "improving fiscal performance targets.", "improving financial performance targets."

You may be able to get more results by adjusting your search query.

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