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