Perhaps you should try some spelling variations:
"improving basic performance risk." » "improving based performance risk.", "improving bank performance risk.", "improving seismic 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 past performance risk." » "improving past performance size.", "improving past performance based.", "improving past performance _.", "improving plant performance risk.", "improving port performance risk.", "improving based performance risk.", "improving asset performance risk.", "improving land performance risk.", "improving air performance risk."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving basic performance risk.") OR ("improving past performance risk."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving basic performance risk.\") OR (\"improving past performance risk.\"))".
• Removing quotes may allow a broader search: (( improving basic performance risk. ) OR ( improving past performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving basic performance risk.") OR ("improving past performance risk."))*.