Perhaps you should try some spelling variations:
"harvard world bank studies firm surveys." » "harvard world urban studies firm surveys.", "harvard world case studies firm surveys.", "harvard world bank study firm surveys.", "harvard world bank studies food surveys.", "harvard world bank studies pre surveys.", "harvard world bank studies firm survey."
"harvard world war studies from series." » "harvard world case studies from series.", "harvard world war studies from sources.", "harvard world war studies from service.", "harvard world war 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 from series.") 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 series.") OR ("harvard world bank studies firm surveys.")).
• Removing quotes may allow a broader search: (( harvard world war studies from series. ) or ( harvard world bank studies firm surveys. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard world war studies from series.") or ("harvard world bank studies firm surveys."))*.