Perhaps you should try some spelling variations:
"harvard world bank studies from surveys." » "harvard world urban studies from surveys.", "harvard world bank studies from survey.", "harvard world bank studies firm surveys.", "harvard world bank studies force surveys."
"harvard cold bank study from series." » "harvard cold bank study rom series.", "harvard cold bank study from services.", "harvard cold bank study forum series.", "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 surveys.") 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 surveys.") OR ("harvard cold bank study from series.")).
• Removing quotes may allow a broader search: (( harvard world bank studies from surveys. ) or ( harvard cold bank study from series. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard world bank studies from surveys.") or ("harvard cold bank study from series."))*.