Perhaps you should try some spelling variations:
"improving shared performances de." » "improving sharia performances de.", "improving related performances de.", "improving care performance de.", "improving stored performances de.", "improving care performances de.", "improving sales performances de.", "improving shared performances _.", "improving shared performances 5.", "improving shared performance der."
"improving urban performance series." » "improving urban performance studies.", "improving urban performance size.", "improving bank performance series.", "improving loan performance series.", "improving human performance series."

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