How could you be is sure? vs how can you be so sure?

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Looking on the internet deeply has found these results:

how could you be is sure? is the most popular phrase on the web. 

how can you be so sure?

1477,000 results on the web

how could you be is sure?

12,180,000,000 results on the web

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Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • Then how can you be so sure?
  • Excuse me, Captain, how can you be so sure?
  • How can you be so sure?
  • Excuse me, Captain, how can you be so sure?
  • Well, how can you be so sure?
  • How can you be so sure? Sheldon?
  • How can you be so sure? I'm not.
  • I hope so, but how can you be so sure?
  • Are you sure? ...OK.
  • It's so awful...
  • Are you sure? Yes, your Holiness.
  • My knowledge of it is profound.
  • Sure?
  • You sure? I could order a test...
  • Who can tell for sure?
  • Are you sure? It's the second round.

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