Perhaps you should try some spelling variations:
"harvard cold bank studies from surveys." » "harvard cold bank study from surveys.", "harvard cold bank studies firm surveys.", "harvard cold bank studies force surveys.", "harvard world bank studies from surveys.", "harvard bond bank studies from surveys.", "harvard good bank studies from surveys."
"harvard good urban studies from survey." » "harvard home urban studies from survey.", "harvard good urban studies firm survey."

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 studies from surveys.") OR ("harvard good urban studies from survey."))~.
• Removing quotes may allow a broader search: (( harvard cold bank studies from surveys. ) or ( harvard good urban studies from survey. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard cold bank studies from surveys.") or ("harvard good urban studies from survey."))*.