This question already has an answer here:
We have a company website, let says it's
http://www.mycompany.com. URL without the
http://mycompany.com) is working and displays the same website.
mycompany, first result is the website, with no site links.
mycompany.com, first result is the website, with site links.
www.mycompany.com, first result is the website, with different site links.
Why is there no site links for "mycompany" keyword?