A question for Vietnamese speakers.

My friend is Vietnamese and she mentioned this book that she really likes. She says that it is pretty famous in Vietnam. I would like to get it for her as a gift. It is called
Trung Chat Trung Nhi. I don’t know how to make the accents and Vietnamese characters on my computer, so i can’t google it. It might be a children’s fable or just a famous story. Does anyone know this??