To find specific types of films, Go to https://library.lmu.edu/
Put in your keyword search term, and note on the left hand side, there are multiple "filters" to narrow down your search. Use Genre/Form and any of the appropriate genres i.e. Feature films, Documentary films
Lots of times you just want a 'feature' film (not educational, not a documentary) --and you can use the "x" box next to whatever you want to exclude.