Perhaps you should try some spelling variations:
"improving gendered performance series." » "improving gender performance series.", "improving general performance series.", "improving measured performance series.", "improving energy performance series.", "improving federal performance series.", "improving gendered performance studies.", "improving gendered performance size."
"improving rural performance series." » "improving rural performance studies.", "improving rural performance size.", "improving euract performance series.", "improving larval performance series.", "improving pupil 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 rural performance series.") or ("improving gendered performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance series.") OR ("improving gendered performance series.")).
• Removing quotes may allow a broader search: (( improving rural performance series. ) or ( improving gendered performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance series.") or ("improving gendered performance series."))*.