Perhaps you should try some spelling variations:
"improving ii performance based." » "improving ii performance measures.", "improving fdi performance based.", "improving its performance based.", "improving miv performance based.", "improving air performance based.", "improving hiv performance based."
"improving plant performance risk." » "improving bank performance risk.", "improving loan performance risk.", "improving port performance risk.", "improving plant performance size.", "improving plant performance _.", "improving plant performance data.", "improving land performance risk.", "improving laws performance risk.", "improving payment 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 ii performance based.") or ("improving plant performance risk."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving ii performance based.") OR ("improving plant performance risk.")).
• Removing quotes may allow a broader search: (( improving ii performance based. ) or ( improving plant performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving ii performance based.") or ("improving plant performance risk."))*.