Searching for books and articles can help you to find a research topic. Look for books in the UCLA Library Catalog and for articles in article databases.
Search for titles in the Library catalog about topics that you like, topics that you found interesting in a class, or topics that you would like to read more about.
Look at what aspects of these topics are treated in published books. If you find something interesting, go to the stacks and look into the book or check it out from the library. Do you agree with the author? Would you want to go in this direction further and find something new? Do you disagree with the author? Would you want to write a paper why? Do you think that there are aspects that are not treated by these books? Would you want to write your paper on those aspects?
Did you find a promising topic? Discuss it with your classmates or instructor.
How to find articles for your topic? Look up an article database that accumulates materials about your discipline (go to Find databases by subject or one of the Library research guides).