Perhaps you should try some spelling variations:
"improving social performance series." » "improving school performance series.", "improving fiscal performance series.", "improving financial performance series.", "improving social performance studies.", "improving social performance size."
"emerging empire performance risk." » "emerging mpi performance risk.", "emerging employee performance risk.", "emerging compiler performance risk.", "emerging empire performance 2019.", "emerging empires performance risk.", "emerging export performance risk."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving social performance series.") or ("emerging empire performance risk."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving social performance series.") OR ("emerging empire performance risk."))*.
• Removing quotes may allow a broader search: (( improving social performance series. ) or ( emerging empire performance risk. ))*.