Perhaps you should try some spelling variations:
"improving do performance metrics." » "improving do performance contracts.", "improving do performance measures.", "improving do performance contract.", "improving job performance metrics.", "improving low performance metrics.", "improving _ performance metrics.", "improving co performance metrics.", "improving food performance metrics."
"improving export performance series." » "improving export performance reviews.", "improving export performance review.", "improving export performance targets.", "improving labor performance series.", "emerging export performance series.", "improving upper performance series."

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