Perhaps you should try some spelling variations:
"harvard world earth studies book series." » "harvard world early studies book series.", "harvard world art studies book series.", "harvard world hart studies book series.", "harvard word earth studies book series.", "harvard world part studies book series.", "harvard world earth studies books series.", "harvard world earth studies ebook series."
"harvard cold bank studies from surveys." » "harvard cold urban studies from surveys.", "harvard cold bank study from surveys.", "harvard cold bank studies from survey.", "harvard cold bank studies firm surveys.", "harvard cold bank studies force surveys.", "harvard world bank studies from surveys.", "harvard bond bank studies from surveys.", "harvard good bank studies from surveys."

Try widening your search to All Fields.

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 earth studies book series.") or ("harvard cold bank studies from surveys."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world earth studies book series.") OR ("harvard cold bank studies from surveys.")).
• Removing quotes may allow a broader search: (( harvard world earth studies book series. ) or ( harvard cold bank studies from surveys. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard world earth studies book series.") or ("harvard cold bank studies from surveys."))*.