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 bank studies food surveys." » "harvard cold bank studies food surveys.", "harvard world urban studies food surveys.", "harvard world bank study food surveys.", "harvard world bank studies from surveys.", "harvard world bank students food surveys.", "harvard world bank studies field surveys.", "harvard world bank studies force 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 world bank studies food surveys."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world war studies book series.") OR ("harvard world bank studies food surveys."))*.
• Removing quotes may allow a broader search: (( harvard world war studies book series. ) or ( harvard world bank studies food surveys. ))*.