Perhaps you should try some spelling variations:
"harvard cold bank studies book series." » "harvard cold urban studies book series.", "harvard cold bank study book series.", "harvard bond bank studies book series.", "harvard good bank studies book series.", "harvard food bank studies book series.", "harvard cold bank studies books series.", "harvard cold bank studies ebook series."
"harvard world bank studies from surveys." » "harvard world urban studies from surveys.", "harvard world bank study from surveys.", "harvard world bank studies from survey.", "harvard world bank studies firm surveys.", "harvard world bank studies force 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 cold bank studies book series.") or ("harvard world bank studies from surveys."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard cold bank studies book series.") OR ("harvard world bank studies from surveys.")).
• Removing quotes may allow a broader search: (( harvard cold bank studies book series. ) or ( harvard world bank studies from surveys. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard cold bank studies book series.") or ("harvard world bank studies from surveys."))*.