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

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