Perhaps you should try some spelling variations:
"improving can performance metrics." » "improving can performance measures.", "improving chain performance metrics.", "improving loan performance metrics.", "improving human performance metrics.", "improving care performance metrics.", "improving a performance metrics.", "improving co 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."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving road performance series.") or ("improving can performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving road performance series.") OR ("improving can performance metrics.")).
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• Adding a wildcard symbol may retrieve word variants: (("improving road performance series.") or ("improving can performance metrics."))*.