Perhaps you should try some spelling variations:
"improving rural performance metrics." » "improving rural performance measures.", "improving euract performance metrics.", "improving larval performance metrics.", "improving pupil performance metrics."
"improving rural performance series." » "improving rural performance studies.", "improving rural performance size.", "improving euract performance series.", "improving larval performance series.", "improving pupil performance series."

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