Perhaps you should try some spelling variations:
"improving co performance contract." » "improving co performance contracts.", "improving ceo performance contract.", "improving do performance contract.", "improving core performance contract.", "improving eco performance contract.", "improving crop performance contract.", "improving ict performance contract."
"improving loan performance measures." » "improving local performance measures.", "improving land performance measures.", "improving lead performance measures."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving loan performance measures.") OR ("improving co performance contract."))~.
• Removing quotes may allow a broader search: (( improving loan performance measures. ) or ( improving co performance contract. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving loan performance measures.") or ("improving co performance contract."))*.