Perhaps you should try some spelling variations:
"harvard world 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 cold case studies from series." » "harvard cold case studies rom series.", "harvard cold case studies from services.", "harvard cold case studies forum series.", "harvard world case studies from series.", "harvard cold call studies from series.", "harvard cold wave studies from 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 world bank study books series.") OR ("harvard cold case studies from series."))~.
• Removing quotes may allow a broader search: (( harvard world bank study books series. ) or ( harvard cold case studies from series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world bank study books series.") or ("harvard cold case studies from series."))*.