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 worst case studies firm surveys." » "harvard worst case studies from surveys.", "harvard worst case studies confirm surveys.", "harvard worst case studies figure surveys.", "harvard worst case studies firm survey.", "harvard worse case studies firm surveys."

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