Perhaps you should try some spelling variations:
"harvard world urban studies book series." » "harvard cold urban studies book series.", "harvard worst urban studies book series.", "harvard world urban studies books series.", "harvard world urban studies ebook series."
"harvard world case studies from series." » "harvard cold case studies from series.", "harvard world case studies rom series.", "harvard world case studies from services.", "harvard world case studies forum series.", "harvard world class studies from 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 urban studies book series.") OR ("harvard world case studies from series."))~.
• Removing quotes may allow a broader search: (( harvard world urban studies book series. ) or ( harvard world case studies from series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world urban studies book series.") or ("harvard world case studies from series."))*.