Perhaps you should try some spelling variations:
"improving animal performance series." » "improving animal performance studies.", "improving animal performance size.", "improving annual performance series.", "improving fiscal performance series.", "improving social performance series.", "improving initial performance series.", "improving optimal performance series.", "improving criminal performance series."
"improving thermal performance review." » "improving thermal performance risk.", "improving thermal performance evidence.", "improving external performance review.", "improving erm performance review.", "improving federal performance review."

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

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