Perhaps you should try some spelling variations:
"short guides to business paper series." » "short guides to business pages series.", "short guides to business papua series.", "short guides to business cape series.", "short guide to business paper series.", "short guides to business cover series."
"Short guides to business case studies." » "Short guides to business cycle studies.", "Short guides to business climate studies."

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

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