Perhaps you should try some spelling variations:
"harvard cold call studies book series." » "harvard cold scale studies book series.", "harvard cold local studies book series.", "harvard cold dalit studies book series.", "harvard cold call studies books series.", "harvard cold call studies ebook series."
"harvard cold bank study from serbia." » "harvard cold bank studies from serbia.", "harvard world bank study from serbia.", "harvard bond bank study from serbia.", "harvard good bank study from serbia."

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 call studies book series.") or ("harvard cold bank study from serbia."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard cold call studies book series.") OR ("harvard cold bank study from serbia."))*.
• Removing quotes may allow a broader search: (( harvard cold call studies book series. ) or ( harvard cold bank study from serbia. ))*.