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

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 from 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 from surveys."))*.
• Removing quotes may allow a broader search: (( harvard world war studies book series. ) or ( harvard worst case studies from surveys. ))*.