Perhaps you should try some spelling variations:
"improve good performance review." » "improve good performance risk.", "improve good performance evidence.", "improve fund performance review.", "improve court performance review.", "improve 2 performance review.", "improve food performance review.", "improved food performance review.", "improve our performance review."
"improving poor performance audit." » "improving poor performance audits.", "improving poor performance a.", "improving sector performance audit.", "improving power performance audit.", "improving food performance audit.", "improving peer performance audit."

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

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