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 sources." » "harvard cold urban studies from sources.", "harvard worst urban studies from sources."

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