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

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 from series.") or ("harvard world bank study book series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world case studies from series.") OR ("harvard world bank study book series.")).
• Removing quotes may allow a broader search: (( harvard world case studies from series. ) or ( harvard world bank study book series. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard world case studies from series.") or ("harvard world bank study book series."))*.