Perhaps you should try some spelling variations:
"harvard world war studies force surveys." » "harvard world war studies force survey.", "harvard world war studies firm surveys.", "harvard world war studies food surveys.", "harvard world war studies pre surveys.", "harvard world bank studies force 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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world case studies from series.") OR ("harvard world war studies force surveys."))~.
• Removing quotes may allow a broader search: (( harvard world case studies from series. ) or ( harvard world war studies force surveys. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world case studies from series.") or ("harvard world war studies force surveys."))*.