Perhaps you should try some spelling variations:
"improving firm performances series." » "improving firm performance series.", "improving firm performance merits.", "improving firm performance studies.", "improving firms performance series.", "improving from performance series.", "improving firms performances series.", "improving air performances series.", "improving erm performances series."
"improving euract performance metrics." » "improving euract performance measures.", "improving act performance metrics.", "improving impact performance metrics.", "improving contract performance metrics.", "improving rural performance metrics.", "improving neural performance metrics.", "improving accuracy performance metrics."

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

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