Perhaps you should try some spelling variations:
"improving local performance metrics." » "improving local performance measures.", "improving social performance metrics.", "improving global performance metrics.", "improving total performance metrics.", "improving fiscal performance metrics."
"improving road performance series." » "improving road performance studies.", "improving road performance size.", "improving board performance series.", "improving good performance series.", "improving bond performance series.", "improving food performance series.", "improving rural 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 road performance series.") OR ("improving local performance metrics."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving road performance series.\") OR (\"improving local performance metrics.\"))".
• Removing quotes may allow a broader search: (( improving road performance series. ) OR ( improving local performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (("improving road performance series.") OR ("improving local performance metrics."))*.