Perhaps you should try some spelling variations:
studies firm » studies from, studies confirm, studies figure
firm surveys » firm survey
studies fuel » studies cruel, studies field, studies from
fuel sources » fuel source
war studies » war stories, early studies
cold war » world war

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( harvard cold war studies firm surveys. ) or ( harvard cold war studies fuel sources. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( harvard cold war studies firm surveys. ) OR ( harvard cold war studies fuel sources. )).
• Adding a wildcard symbol may retrieve word variants: (( harvard cold war studies firm surveys. ) or ( harvard cold war studies fuel sources. ))*.