Perhaps you should try some spelling variations:
"improving asset performance evidence." » "improving dataset performance evidence.", "improving market performance evidence.", "improving affect performance evidence.", "improving adult performance evidence.", "improving audit performance evidence.", "improving fast performance evidence."
"improving port performance risk." » "improving port performance 2019.", "improving export performance risk.", "improving court performance risk.", "improving plant performance risk.", "improving post performance risk.", "improving poor performance risk."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving port performance risk.") OR ("improving asset performance evidence."))~.
• Removing quotes may allow a broader search: (( improving port performance risk. ) or ( improving asset performance evidence. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving port performance risk.") or ("improving asset performance evidence."))*.