Perhaps you should try some spelling variations:
"harvard world bank studies from series." » "harvard world urban 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 worst case studies book series." » "harvard worse case studies book series."

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"harvard worst case studies book series.\") OR (\"harvard world bank studies from series.\"))~".
• Removing quotes may allow a broader search: (( harvard worst case studies book series. ) OR ( harvard world bank studies from series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard worst case studies book series.") OR ("harvard world bank studies from series."))*.