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

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

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