Perhaps you should try some spelling variations:
"improving poverty performance series." » "improving energy performance series.", "improving safety performance series.", "improving overall performance series.", "improving poverty performance studies.", "improving poverty performance size.", "improving property performance series.", "improving power performance series.", "improving coverage performance series."
"improving human performance review." » "improving human performance risk.", "improving human performance evidence.", "improving loan performance review.", "improving thermal performance review.", "improving chain 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 human performance review.") or ("improving poverty performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance review.") OR ("improving poverty performance series.")).
• Removing quotes may allow a broader search: (( improving human performance review. ) or ( improving poverty performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving human performance review.") or ("improving poverty performance series."))*.