Perhaps you should try some spelling variations:
"harvard world bank studies book series." » "harvard world urban studies book series.", "harvard world bank study book series."
"harvard world case studies from service." » "harvard world case studies food service.", "harvard world case studies from serbia.", "harvard world class studies from service.", "harvard worst case studies from service."

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: (("harvard world bank studies book series.") OR ("harvard world case studies from service."))~.
• Removing quotes may allow a broader search: (( harvard world bank studies book series. ) or ( harvard world case studies from service. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world bank studies book series.") or ("harvard world case studies from service."))*.