Perhaps you should try some spelling variations:
"improving basic performance risk." » "improving music performance risk.", "improving baseline performance risk.", "improving seismic performance risk.", "improving basic performance 2019.", "improving air performance risk.", "improve basic performance risk."
"improving based performance based." » "improving board performance based.", "improving fund performance based.", "improving good performance based.", "improving care performance based.", "improving asset performance based.", "improving beef performance based."

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