Perhaps you should try some spelling variations:
"harvard worst case studies from surveys." » "harvard worst case studies from survey.", "harvard worst case studies firm surveys.", "harvard worst case studies force surveys.", "harvard worse case studies from surveys."
"harvard cold bank study fuel source." » "harvard world bank study fuel source.", "harvard bond bank study fuel source.", "harvard good bank study fuel source.", "harvard cold bank study fuel sources.", "harvard cold bank study fuel resource."

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 from surveys.") OR ("harvard cold bank study fuel source."))~.
• Removing quotes may allow a broader search: (( harvard worst case studies from surveys. ) or ( harvard cold bank study fuel source. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard worst case studies from surveys.") or ("harvard cold bank study fuel source."))*.