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 bank performance review." » "improving bank performance risk.", "improving bank performance evidence.", "improving urban performance review.", "improving basic performance review.", "improving brain performance review."

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

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