Perhaps you should try some spelling variations:
"improving statistics performance measures." » "improving statistical performance measures.", "improving logistics performance measures.", "improving logistic performance measures.", "import statistics performance measures."
"improving based performance based." » "improving bank performance based.", "improving care performance based.", "improving board performance based.", "improving basic performance based.", "improving shared performance based.", "improving water performance based."

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

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