Perhaps you should try some spelling variations:
"harvard world bank study from surveys." » "harvard cold bank study from surveys.", "harvard world bank study from survey.", "harvard world bank study firm surveys.", "harvard world bank study force surveys.", "harvard world bank studies from surveys."
"harvard worst case studies book series." » "harvard worse case studies book series.", "harvard worst case studies books series.", "harvard worst case studies ebook 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 worst case studies book series.") OR ("harvard world bank study from surveys."))~.
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• Adding a wildcard symbol may retrieve word variants: (("harvard worst case studies book series.") or ("harvard world bank study from surveys."))*.