Perhaps you should try some spelling variations:
"improving company performance series." » "improving country performance series.", "improving company performance studies.", "improving company performance size.", "improve company performance series.", "improving compliance performance series.", "improving community performance series."
"improving bank performance series." » "improving bank performance studies.", "improving bank performance size.", "improving urban performance series.", "improving basic performance series.", "improving brain 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 company performance series.") or ("improving bank performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving company performance series.") OR ("improving bank performance series.")).
• Removing quotes may allow a broader search: (( improving company performance series. ) or ( improving bank performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving company performance series.") or ("improving bank performance series."))*.