Perhaps you should try some spelling variations:
"improving asset performance based." » "improving market performance based.", "improving based performance based.", "improving past performance based.", "improving asset performance measures.", "improving sme performance based.", "improving adult performance based."
"improving birth performance data." » "improving firm performance data.", "improving high performance data.", "improving port performance data.", "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 based.") OR ("improving birth performance data."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving asset performance based.\") OR (\"improving birth performance data.\"))".
• Removing quotes may allow a broader search: (( improving asset performance based. ) OR ( improving birth performance data. )).
• Adding a wildcard symbol may retrieve word variants: (("improving asset performance based.") OR ("improving birth performance data."))*.