If you are looking for books by Plato, try an author search for "Plato."
If you are looking for books about Plato, try a subject search for "Plato."
If you want to see all the books that the library owns that have anything to do with Plato, try a keword search for "Plato."
Do you want to see if the library has any materials by other Platos? Try browsing the catalog instead of searching. Browse the author list for "Plato" to see a list of all authors with the last name of Alcott.