Perhaps you should try some spelling variations:
"improving asset performance measures." » "improving market performance measures.", "improving based performance measures.", "improving past performance measures.", "improving sme performance measures.", "improving adult performance measures."
"improving birth performance data." » "improving firm performance data.", "improving high performance data.", "improving port performance data.", "improving birth performance based.", "improving birth performance _.", "improving air performance data.", "improving health performance data.", "improving growth performance data."

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

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