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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("harvard world case studies book series.") or ("harvard world bank studies from service."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world case studies book series.") OR ("harvard world bank studies from service."))*.
• Removing quotes may allow a broader search: (( harvard world case studies book series. ) or ( harvard world bank studies from service. ))*.