Perhaps you should try some spelling variations:
"improving land performance series." » "improving land performance metrics.", "improving land performance reviews.", "improving land performance review.", "improving plant performance series.", "improving bank performance series.", "improving loan performance series.", "improved land performance series."
"improving food performance series." » "improving food performance metrics.", "improving food performance reviews.", "improving food performance review.", "improving good performance series.", "improving poor performance series.", "improving fund 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 land performance series.") or ("improving food performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving land performance series.") OR ("improving food performance series.")).
• Removing quotes may allow a broader search: (( improving land performance series. ) or ( improving food performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving land performance series.") or ("improving food performance series."))*.