If you try Diana Wynne Jones, also look for Joan Aiken, probably best known for 'The Wolves of Willoughby Chase' and many sequels. Not magic, but alternative, historic England. Also many short story collections with either magic or strangeness in them.
As for Asimov, I don't know about 'themes', but I read 'I, Robot' when I was 10, and enjoyed reading the 'history' of robots, in a series of short stories.
As for Asimov, I don't know about 'themes', but I read 'I, Robot' when I was 10, and enjoyed reading the 'history' of robots, in a series of short stories.