When considering the fairy tale that you will be researching, you'll need to think about a theme or aspect of the story to research. Instead of just searching "Cinderella" you may want to consider using a search string like "Cinderella AND gender" or "Cinderella AND family relationships" or even "Cinderella AND adaptations" --- by describing your topic a bit more with keywords, you will get more focused search results.
In all of our databases you have the opportunity to limit your results. Most of the time the limiters will be on the left-hand side of the screen and include check boxes like "Scholarly (Peer Reviewed) Journals" or "Academic Journals" or even limit your results by date!
If you need help with your research, don't hesitate to set up a consultation with an LSU Librarian here: https://lsu.libcal.com/appointments