Perhaps you should try some spelling variations:
"harvard world class studies book series." » "harvard world cass studies book series.", "harvard world cases studies book series.", "harvard world css studies book series.", "harvard world class studies books series.", "harvard world class studies ebook series."
"harvard cold war studies from sources." » "harvard cold war stories from sources.", "harvard cold early studies from sources.", "harvard world war studies from 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 class studies book series.") or ("harvard cold war studies from sources."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world class studies book series.") OR ("harvard cold war studies from sources."))*.
• Removing quotes may allow a broader search: (( harvard world class studies book series. ) or ( harvard cold war studies from sources. ))*.