Perhaps you should try some spelling variations:
"improve baseline performance series." » "improve baldrige performance series.", "improve based performance series.", "improve basic performance series.", "improve baseline performance studies.", "improve baseline performance size.", "impact baseline performance series.", "improve machine performance series."
"improving past performance evidence." » "improving plant performance evidence.", "improving port performance evidence.", "improving transit performance evidence.", "improving fast performance evidence.", "improving post performance evidence."

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