Perhaps you should try some spelling variations:
"improving sectoral performance evidence." » "improving sector performance evidence.", "improving school performance evidence.", "improving social performance evidence.", "improving central performance evidence.", "improving mental performance evidence."
"improving food performance metrics." » "improving food performance contracts.", "improving food performance measures.", "improving food performance contract.", "improving good performance metrics.", "improving poor performance metrics.", "improving fund performance metrics.", "improving land performance metrics."

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