Perhaps you should try some spelling variations:
"short guides to business case series." » "short guides to business climate series.", "short guide to business case series.", "short guides to business care series.", "short guides to business cass series.", "short guides to business case stories."
"Short guides to business cycle studies." » "Short guides to business creole studies.", "Short guides to business case studies.", "Short guides to business scale studies."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("short guides to business case series.") or ("Short guides to business cycle studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("short guides to business case series.") OR ("Short guides to business cycle studies.")).
• Removing quotes may allow a broader search: (( short guides to business case series. ) or ( Short guides to business cycle studies. )).
• Adding a wildcard symbol may retrieve word variants: (("short guides to business case series.") or ("Short guides to business cycle studies."))*.