Perhaps you should try some spelling variations:
"improving co performance metrics." » "improving co performance contracts.", "improving co performance measures.", "improving co performance contract.", "improving do performance metrics.", "improving crop performance metrics.", "improving job performance metrics.", "improving _ performance metrics.", "improving macro 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."

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 co performance metrics."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving export performance series.\") OR (\"improving co performance metrics.\"))*".
• Removing quotes may allow a broader search: (( improving export performance series. ) OR ( improving co performance metrics. ))*.