Perhaps you should try some spelling variations:
"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."
"improving do performance contracts." » "improving job performance contracts.", "improving low performance contracts.", "improving _ performance contracts.", "improving co performance contracts.", "improving food performance contracts."

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