Perhaps you should try some spelling variations:
"improving maternal performance measures." » "improving materials performance measures.", "improving external performance measures.", "improving national performance measures.", "improve maternal performance measures.", "improving water performance measures."
"improving pupil performance review." » "improving pupil performance risk.", "improving pupil performance evidence.", "improving social performance review.", "improving model performance review.", "improving judicial performance review.", "improving public performance review.", "improving civil performance review.", "improving audit performance review."

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

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