Perhaps you should try some spelling variations:
"harvard world bank study books series." » "harvard cold bank study books series.", "harvard world bank study book series.", "harvard world bank study books strips.", "harvard world bank study booklet series.", "harvard world bank story books series.", "harvard world bank student books series."
"harvard good urban studies from surveys." » "harvard cold urban studies from surveys.", "harvard home urban studies from surveys.", "harvard good urban studies from survey.", "harvard good urban studies firm surveys.", "harvard good urban studies force 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 books series.") OR ("harvard good urban studies from surveys."))~.
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• Adding a wildcard symbol may retrieve word variants: (("harvard world bank study books series.") or ("harvard good urban studies from surveys."))*.