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 poor performance series." » "improving poor performance reviews.", "improving poor performance review.", "improving poor performance targets.", "improving export performance series.", "improving sector performance series.", "improving _ performance series.", "improving power performance series.", "improving food performance series.", "improving indoor 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 poor performance series.") OR ("improving co performance metrics."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving poor performance series.\") OR (\"improving co performance metrics.\"))".
• Removing quotes may allow a broader search: (( improving poor performance series. ) OR ( improving co performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (("improving poor performance series.") OR ("improving co performance metrics."))*.