Perhaps you should try some spelling variations:
"improving seismic performance series." » "improving logistics performance series.", "improving economic performance series.", "improving academic performance series.", "improving seismic performance metrics.", "improving seismic performance reviews.", "improving seismic performance review.", "improving service performance series.", "improving basic performance series.", "improving statistics performance series."
"improving based performance risk." » "improving bank performance risk.", "improving care performance risk.", "improving board performance risk.", "improving based performance size.", "improving based performance based.", "improving based performance _.", "improving basic performance risk.", "improving shared performance risk.", "improving water performance risk."

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 risk."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving seismic performance series.\") OR (\"improving based performance risk.\"))".
• Removing quotes may allow a broader search: (( improving seismic performance series. ) OR ( improving based performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving seismic performance series.") OR ("improving based performance risk."))*.