Your assignment asks you to consult sources to support the arguments you make in your paper. Below are three searches that demonstrate multiple angles you can take in finding and using sources as evidence. I would try all three!
In this approach, you are looking for articles that connect a theme and a film.
Remember that not all themes pop up in all films. Consider browsing results for articles that are just about your film and exploring the themes that scholars are already talking about.
In this approach, you are searching for articles about your theme unattached to the film. This is helpful if you want a scholarly perspective on a theme that you can then apply to your film on your own.
In this approach, you are seeking articles that connect a theme to Don Quixote.