Perhaps you should try some spelling variations:
"going general performance series." » "going federal performance series.", "going senegal performance series.", "going gendered performance series.", "going general performance studies.", "going general performance size.", "iag general performance series.", "modeling general performance series.", "gendhing general performance series."
"improving global performance series." » "improving global performance studies.", "improving global performance size.", "improving total performance series.", "improving regional performance series.", "improving fiscal performance series.", "improving growth performance series.", "providing global 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: (("improving global performance series.") or ("going general performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving global performance series.") OR ("going general performance series.")).
• Removing quotes may allow a broader search: (( improving global performance series. ) or ( going general performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving global performance series.") or ("going general performance series."))*.