Perhaps you should try some spelling variations:
"harvard second urban studies from series." » "harvard second loan studies from series.", "harvard second rural studies from series.", "harvard second urban studies from sources.", "harvard second urban studies from service.", "harvard second urban studies from surveys."
"harvard world bank study from series." » "harvard world bank study from sources.", "harvard world bank study from service.", "harvard world bank study from surveys."

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 world bank study from series.") OR ("harvard second urban studies from series."))~.
• Removing quotes may allow a broader search: (( harvard world bank study from series. ) or ( harvard second urban studies from series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world bank study from series.") or ("harvard second urban studies from series."))*.