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 urban studies from series." » "harvard cold urban studies from series.", "harvard worst urban studies from series.", "harvard world urban studies rom series.", "harvard world urban studies from services.", "harvard world urban studies forum series."

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