Perhaps you should try some spelling variations:
"harvard world bank studies from series." » "harvard world urban studies from series.", "harvard world case studies from series.", "harvard world bank study from series.", "harvard world bank studies from sources.", "harvard world bank studies from service.", "harvard world bank studies from surveys."
"harvard world war studies book series." » "harvard world case studies book 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 war studies book series.") OR ("harvard world bank studies from series."))~.
• Removing quotes may allow a broader search: (( harvard world war studies book series. ) or ( harvard world bank studies from series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world war studies book series.") or ("harvard world bank studies from series."))*.