Perhaps you should try some spelling variations:
"harvard cold war studies books series." » "harvard cold war studies book series.", "harvard cold war studies booklet series.", "harvard cold war student books series.", "harvard cold war studies books strips.", "harvard cold war stories books series.", "harvard cold early studies books series."
"harvard world war studies fuel source." » "harvard world war studies cruel source.", "harvard world war studies field source.", "harvard world war studies from source.", "harvard world war stories fuel source.", "harvard world early studies fuel source.", "harvard world war studies fuel sources.", "harvard world war studies fuel resource."

Try widening your search to All Fields.

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