Perhaps you should try some spelling variations:
"emerging compiler performance risks." » "emerging complex performance risks.", "emerging completed performance risks.", "emerging composite performance risks.", "emerging companies performance risks.", "emerging consumer performance risks.", "emerging empire performance risks.", "emerging compiler performance risk."
"improving social performance series." » "improving school performance series.", "improving fiscal performance series.", "improving financial performance series.", "improving social performance studies.", "improving social performance size."

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 compiler performance risks."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving social performance series.") OR ("emerging compiler performance risks."))*.
• Removing quotes may allow a broader search: (( improving social performance series. ) or ( emerging compiler performance risks. ))*.