I think you need a different keyword logic.
Please check the documentation:
Search logic settings
Search logic explained with examples
You should try the “AND” logic or the “AND with exact keyword matches” logic, since there are lots of movies in your database, it will fit better. The default “OR” logic is to match as many items as possible, while you probably only want a very few, but relevant results.
If you want an more specific, occurrence based relevancy, I can also recommend using the index table engine. For that, please check chapter 12, 12.1, 12.2, 12.3 in the documentation: https://goo.gl/ooNYPY