Perhaps you should try some spelling variations:
"improving basic performance risk." » "improving based performance risk.", "improving bank performance risk.", "improving past performance risk.", "improving basic performance size.", "improving basic performance based.", "improving basic performance _.", "improving air performance risk.", "improve basic performance risk.", "improving public performance risk."
"improving port performance risk." » "improving port performance size.", "improving port performance based.", "improving port performance _.", "improving export performance risk.", "improving court performance risk.", "improving plant performance risk.", "improving poverty performance risk.", "improving birth 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 basic performance risk.") OR ("improving port performance risk."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving basic performance risk.\") OR (\"improving port performance risk.\"))".
• Removing quotes may allow a broader search: (( improving basic performance risk. ) OR ( improving port performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving basic performance risk.") OR ("improving port performance risk."))*.