Perhaps you should try some spelling variations:
"harvard world bank studies from sources." » "harvard world urban studies from sources.", "harvard world case studies from sources.", "harvard world bank studies fuel sources.", "harvard world bank studies from survey."
"harvard cold bank study from series." » "harvard cold bank study from service.", "harvard cold bank study from surveys.", "harvard cold bank study from serbian.", "harvard bond bank study from series.", "harvard good bank study from series.", "harvard food bank study from series."

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