Perhaps you should try some spelling variations:
"harvard cold water studies book series." » "harvard cold tracer studies book series.", "harvard cold case studies book series.", "harvard cold water sources book series.", "harvard cold water studies from series.", "harvard cold war studies book series.", "harvard cold winters studies book series."
"harvard world war studies book series." » "harvard world war studies from series.", "harvard world case studies book series.", "harvard world bank studies book series."

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

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