Perhaps you should try some spelling variations:
"harvard cold event studies from series." » "harvard cold event studies from sources.", "harvard cold event studies from service.", "harvard cold event studies from surveys.", "harvard child event studies from series."
"harvard cold case studies book series." » "harvard world case studies book series.", "harvard cold wave studies book 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 cold case studies book series.") OR ("harvard cold event studies from series."))~.
• Removing quotes may allow a broader search: (( harvard cold case studies book series. ) or ( harvard cold event studies from series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard cold case studies book series.") or ("harvard cold event studies from series."))*.