Perhaps you should try some spelling variations:
"improving rural performance risk." » "improving pupil performance risk.", "improving thermal performance risk.", "improving overall performance risk.", "improving rural performance size.", "improving rural performance based.", "improving rural performance _.", "improving urban performance risk.", "improving social performance risk."
"improving food performance evidence." » "improving good performance evidence.", "improving poor performance evidence.", "improving fund performance evidence.", "improving land performance evidence."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving food performance evidence.") OR ("improving rural performance risk."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving food performance evidence.\") OR (\"improving rural performance risk.\"))*".
• Removing quotes may allow a broader search: (( improving food performance evidence. ) OR ( improving rural performance risk. ))*.