Perhaps you should try some spelling variations:
"improving logistics performance contracts." » "improving cognitive performance contracts."
"improving past performance based." » "improving past performance measures.", "improving plant performance based.", "improving port performance based.", "improving based performance based.", "improving basic performance based.", "improving asset performance based.", "improving land 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 logistics performance contracts.") or ("improving past performance based."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving logistics performance contracts.") OR ("improving past performance based.")).
• Removing quotes may allow a broader search: (( improving logistics performance contracts. ) or ( improving past performance based. )).
• Adding a wildcard symbol may retrieve word variants: (("improving logistics performance contracts.") or ("improving past performance based."))*.