Perhaps you should try some spelling variations:
"harvard world case studies book series." » "harvard world case studies from series.", "harvard world class studies book series.", "harvard worst case studies book series."
"harvard cold bank studies fuel sources." » "harvard cold urban studies fuel sources.", "harvard cold bank study fuel sources.", "harvard cold bank studies from sources.", "harvard cold bank studies food sources.", "harvard cold bank studies led sources.", "harvard cold bank studies fuel source.", "harvard world bank studies fuel sources.", "harvard bond bank studies fuel sources.", "harvard good bank studies fuel sources."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("harvard world case studies book series.") or ("harvard cold bank studies fuel sources."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world case studies book series.") OR ("harvard cold bank studies fuel sources."))*.
• Removing quotes may allow a broader search: (( harvard world case studies book series. ) or ( harvard cold bank studies fuel sources. ))*.