Perhaps you should try some spelling variations:
"harvard world war studies from sources." » "harvard cold war studies from sources.", "harvard world war stories from sources.", "harvard world early studies from sources."
"harvard world bank studies firm surveys." » "harvard cold bank studies firm surveys.", "harvard world urban studies firm surveys.", "harvard world bank study firm surveys.", "harvard world bank studies confirm surveys.", "harvard world bank studies figure surveys.", "harvard world bank studies formal surveys.", "harvard world bank studies firm survey."

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