Perhaps you should try some spelling variations:
"improving seismic performance series." » "improving economic performance series.", "improving academic performance series.", "improving seismic performance studies.", "improving seismic performance size.", "improving semantic performance series.", "improving service performance series.", "improving basic performance series."
"improving based performance evidence." » "improving board performance evidence.", "improving fund performance evidence.", "improving good performance evidence.", "improving basic performance evidence.", "improving care performance evidence.", "improving asset 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: (("improving seismic performance series.") or ("improving based performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving seismic performance series.") OR ("improving based performance evidence.")).
• Removing quotes may allow a broader search: (( improving seismic performance series. ) or ( improving based performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("improving seismic performance series.") or ("improving based performance evidence."))*.