Perhaps you should try some spelling variations:
"improving do performance metrics." » "improving do performance measures.", "improving di performance metrics.", "improving 2 performance metrics.", "improving 3 performance metrics.", "improving co performance metrics.", "improving eco performance metrics.", "improving pro performance metrics."
"emerging post performance series." » "emerging post performance studies.", "emerging post performance size.", "emerging port performance series.", "emerging past performance series.", "emerging boost performance series.", "emerging pest performance series.", "emerging pests performance series.", "emerging best performance series."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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