Perhaps you should try some spelling variations:
"improving co performance contract." » "improving co performance contracts.", "improving do performance contract.", "improving crop performance contract.", "improving job performance contract.", "improving _ performance contract.", "improving macro performance contract.", "improving food performance contract."
"improving local performance series." » "improving local performance metrics.", "improving local performance reviews.", "improving local performance review.", "improving social performance series.", "improving loan performance series.", "improving fiscal performance series.", "improving global performance series."

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