Perhaps you should try some spelling variations:
"harvard cold event studies from surveys." » "harvard cold event studies from survey.", "harvard cold event studies firm surveys.", "harvard cold event studies force surveys.", "harvard child event studies from surveys."
"harvard blood case studies book series." » "harvard flood case 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 event studies from surveys.") or ("harvard blood case studies book series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard cold event studies from surveys.") OR ("harvard blood case studies book series.")).
• Removing quotes may allow a broader search: (( harvard cold event studies from surveys. ) or ( harvard blood case studies book series. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard cold event studies from surveys.") or ("harvard blood case studies book series."))*.