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 food service." » "harvard cold war studies food service.", "harvard world war studies from service.", "harvard world war students food service.", "harvard world war studies field service.", "harvard world war studies food price.", "harvard world war stories food service.", "harvard world early studies food service."

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 food service."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world war studies book series.") OR ("harvard world war studies food service."))*.
• Removing quotes may allow a broader search: (( harvard world war studies book series. ) or ( harvard world war studies food service. ))*.