Perhaps you should try some spelling variations:
"improving company performance based." » "improving country performance based.", "improve company performance based.", "improving compliance performance based.", "improving community performance based."
"improving pupil performance measures." » "improving social performance measures.", "improving model performance measures.", "improving judicial performance measures.", "improving public performance measures.", "improving civil performance measures.", "improving audit performance measures."

Try widening your search to All Fields.

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