Perhaps you should try some spelling variations:
"harvard worst case studies book series." » "harvard worst case studies from series.", "harvard worse case studies book series."
"harvard cold war studies fuel sources." » "harvard cold war studies from sources.", "harvard cold war studies food sources.", "harvard cold war studies led sources.", "harvard cold war studies fuel source.", "harvard cold bank studies fuel sources.", "harvard world war studies fuel sources."

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 cold war studies fuel sources."))~.
• Removing quotes may allow a broader search: (( harvard worst case studies book series. ) or ( harvard cold war studies fuel sources. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard worst case studies book series.") or ("harvard cold war studies fuel sources."))*.