I went to two book shops (in Central and Egalite Books near the post office) and I found these writers in Thai: Gabriel Garcia Marquez, Pramoedya Ananta Toer, Haruki Murakami (Murakami Haruki), J. M. Coetzee, John Steinbeck, and Franz Kafka. I looked in two bookshops, total about 15 minutes, and found these books. So you can find them too.