As a father, what can I do to make my daughters happy if I'm working abroad?

My dad left for the States when I was in pre-school. Since then, we've been keeping in touch through phone calls. And more recently, through Skype and social media. It wasn't easy. But, we made it work. He'd come home once every 1-2 years and he was there for both my HS and College graduations. I'm happy to say we have a very close relationship until now that I'm 30 years old. I still miss him, though. He has a new family now but I'm proud that the distance never affected our bond. I think not many people can say that. So I still count myself blessed. :)