Perhaps you should try some spelling variations:
"improving public performance risk." » "improving building performance risk.", "improving specific performance risk.", "improving quality performance risk.", "improving public performance size.", "improving public performance based.", "improving public performance _."
"improving land performance risk." » "improving land performance size.", "improving land performance based.", "improving land performance _.", "improving plant performance risk.", "improving bank performance risk.", "improving loan performance risk.", "improved land performance risk."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving public performance risk.") or ("improving land performance risk."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving public performance risk.") OR ("improving land performance risk.")).
• Removing quotes may allow a broader search: (( improving public performance risk. ) or ( improving land performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving public performance risk.") or ("improving land performance risk."))*.