Perhaps you should try some spelling variations:
"improving industry performance review." » "improving industrial performance review.", "improving country performance review.", "improving entry performance review.", "improved industry performance review.", "improving indoor performance review.", "improving industry performance risk.", "improving industry performance evidence."
"improving worker performance series." » "improving work performance series.", "improving market performance series.", "improving poor performance series.", "improving worker performance studies.", "improving worker performance size.", "improving water performance series."

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

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