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 bank performance metrics." » "improving bank performance measures.", "improving urban performance metrics.", "improving basic performance metrics.", "improving brain performance metrics."

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 bank performance metrics.") OR ("improving co performance contract."))~.
• Removing quotes may allow a broader search: (( improving bank performance metrics. ) or ( improving co performance contract. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving bank performance metrics.") or ("improving co performance contract."))*.