Perhaps you should try some spelling variations:
"improving has performance reviews." » "improving has performance review.", "improving has performance reports.", "improving has performance results.", "improving als performance reviews.", "improving bus performance reviews.", "improving frs performance reviews.", "improving fast performance reviews.", "improving a performance reviews.", "improving hiv performance reviews."
"improving und performance risks." » "improving und performance risk.", "improving fund performance risks.", "improving funds performance risks.", "improving good performance risks.", "improving food performance risks.", "improving burn performance risks.", "improving feed performance risks."

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

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