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Those are know as "Sitelinks" Here is the official page from Google about them, https://support.google.com/webmasters/answer/47334?hl=en "At the moment, sitelinks are automated. We're always working to improve our sitelinks algorithms, and we may incorporate webmaster input in the future." Google Having a good linking structure that is clear on your site, will help promote that. However you will also only get sitelinks when your site is an authoritative source for that search term.