Perhaps you should try some spelling variations:
"improving plant performance review." » "improving plant performance risk.", "improving plant performance evidence.", "improving bank performance review.", "improving loan performance review.", "improving port performance review.", "improving land performance review.", "improving laws performance review.", "improving payment performance review."
"improving poor performance series." » "improving poor performance metrics.", "improving poor performance reviews.", "improving poor performance targets.", "improving export performance series.", "improving sector performance series.", "improving _ performance series.", "improving power performance series.", "improving food performance series.", "improving indoor performance series."

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 plant performance review.") OR ("improving poor performance series."))~.
• Removing quotes may allow a broader search: (( improving plant performance review. ) or ( improving poor performance series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving plant performance review.") or ("improving poor performance series."))*.