Did you ever notice a search result from Google that the first row sometimes displays like this?

These are called Sitelinks which actually a website links that appears under the search results. Sitelinks are used to navigate easily into other section of your website. Sitelinks are generated based on Google ranking and their systems analyze the link structure of your site to find shortcuts that will save users time and allow them to quickly find the information they're looking for. It normally displays up to 6 links under the main link of your website/page.  If Google algorithms can't find good Sitelinks or relevant to the user's search query the Sitelinks will not display. These sitelinks are manageable under the Google Webmaster Tool.
 

How to Display Sitelinks in Google Search Result

Sitelinks are currently automated and Google are still working to improve their algorithms. It is best to make use of archor text and alt text to generate quality sitelinks. The best way to show them website internal links and other pages is through using a excellent CSS Drop Down Menu. Next step is to work hard on increasing more backlinks so that your site PageRank may increase. Sites which have PR>2 generally have sitelinks. Therefore, increase your PageRank and give more attention towards for better optimizing of your site.

How to Control the Sitelinks Display

It is important to always give a good impression on your visitor from the list of sitelinks that appear under your website. Since sitelinks are automatically generated base on their algorithm it is possible that there are inappropriate or incorrect sitelinks to be displayed. In this case you can Demote a URL from a sitelink to removed these inappropriate sitelinks.

To demote a sitelink URL:

1. On the Webmaster Tools Home page, click the site you want.
2. Under Site configuration, click Sitelinks.
3. In the For this search result box, complete the URL for which you don't want a specific sitelink URL to appear. (How to find the right URL.)
4. In the Demote this sitelink URL box, complete the URL of the sitelink you want to demote.

Demo a URL from a sitelink usually takes 2-3 days but it is not guaranteed that the sitelink will no longer display as a sitelink. Demotions are effective for 90 days from your most recent visit to the Sitelinks page in Webmaster Tools.

I hope these will help you optimized more on your website sitelinks on Google search results.