Perhaps you should try some spelling variations:
"harvard world war studies book series." » "harvard world case studies book series.", "harvard world bank studies book series."
"harvard world urban studies from series." » "harvard world ran studies from series.", "harvard world urban studies from sources.", "harvard world urban studies from service.", "harvard world urban studies from surveys."

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