Read the Strugatsky brothers. They are Russian and from the 60's onwards and are as good as Clarke / Asimov.
I recommend Roadside Picnic to begin with. You can find it free here:
http://lib.ru/STRUGACKIE/engl_picnic.txt
Edit: On second thoughts, it may not be your cup of tea. Think of Clarke's Childhood End. It's thought provoking, not just fun.