Website works without www prefix only!

I am working on IIS for the first time, but my website is php, but i dont think the issue is within php, because:

if i enter: thevietnamtourism.com it works fine.

but if i enter: www.thevietnamtourism.com it returns “File not found”

The cname record already exists.

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Why does the www error page not look like this?

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