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