Perhaps you should try some spelling variations:
"improving animal performance series." » "improving animal performance studies.", "improving animal performance size.", "improving annual performance series.", "improving thermal performance series.", "improving fiscal performance series.", "improving initial performance series.", "improving optimal performance series.", "improving criminal performance series."
"improving land performance evidence." » "improving plant performance evidence.", "improving fund performance evidence.", "improving und performance evidence."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving animal performance series.") or ("improving land performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving animal performance series.") OR ("improving land performance evidence.")).
• Removing quotes may allow a broader search: (( improving animal performance series. ) or ( improving land performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("improving animal performance series.") or ("improving land performance evidence."))*.