Perhaps you should try some spelling variations:
"harvard cold bank study from sources." » "harvard cold bank study fuel sources.", "harvard cold bank study from survey.", "harvard cold bank studies from sources.", "harvard world bank study from sources.", "harvard bond bank study from sources.", "harvard good bank study from sources."
"harvard world urban studies book series." » "harvard world urban studies from series.", "harvard world ran studies book series."

You may be able to get more results by adjusting your search query.

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