Perhaps you should try some spelling variations:
"harvard world war studies book series." » "harvard world war studies from series.", "harvard world case studies book series.", "harvard world bank studies book series."
"harvard cold war studies fuel sources." » "harvard cold war studies from sources.", "harvard cold war studies food sources.", "harvard cold war studies led sources.", "harvard cold war studies fuel source.", "harvard cold case studies fuel sources.", "harvard cold bank 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 cold 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 cold war studies fuel sources.")).
• Removing quotes may allow a broader search: (( harvard world war studies book series. ) or ( harvard cold war studies fuel sources. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard world war studies book series.") or ("harvard cold war studies fuel sources."))*.