Perhaps you should try some spelling variations:
"improve maternal performance contract." » "improve materials performance contract.", "improve external performance contract.", "improve national performance contract.", "improve maternal performance contracts.", "improving maternal performance contract.", "improve water performance contract."
"improving school performance targets." » "improving schools performance targets.", "improving preschool performance targets.", "improve school 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 school performance targets.") or ("improve maternal performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving school performance targets.") OR ("improve maternal performance contract.")).
• Removing quotes may allow a broader search: (( improving school performance targets. ) or ( improve maternal performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving school performance targets.") or ("improve maternal performance contract."))*.