I've notice that some sites which show up in the google search results have what i can only describe as pre-defind sub links listed under the main result. like the following
Was there a question related to them? Or were you simply sharing an observation? They are called Google sitelinks. You can't really do anything to get them other than having a good internal linking structure/navigation. Google decides when and if they want to show them. If a link shows up that you don't want there, you can use Google Webmaster Tools to block the link from being shown in which case they will pick a different URL to show.