Perhaps you should try some spelling variations:
"improving road performance metrics." » "improving road performance contracts.", "improving road performance measures.", "improving road performance contract.", "improving board performance metrics.", "improving loan performance metrics.", "improving good performance metrics.", "improving food performance metrics.", "improving urban performance metrics.", "improving rural 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 road performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving export performance series.") OR ("improving road performance metrics.")).
• Removing quotes may allow a broader search: (( improving export performance series. ) or ( improving road performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (("improving export performance series.") or ("improving road performance metrics."))*.