can someone help me find my dad please?

hi, im sara-emily, 21 years of age and looking for my dad. I don't really know much about him apart from he's Spanish, born in 1965 and his full name is Juan Carlos Sanda Gonzalez. My mum hasn't really told me much apart from they travelled a lot when they were together. All i have is two pictures of him and I dont have a clue where in the world he could be.
I don't mind if i find him and he does'nt want me around, i'd just like to know he is out there somewhere, maybe even find out if there are half siblings aroundand about my spanish side of the family.
Please can some one help me? I have tried some online sites and haven't come anywhare with it.
I would be very greatful.

Sara-Emily