Subzin is a fun site - you can search the scripts of many Movies and TV programmes to find the a phrase which you remember, but can't quite remember which Film/Show it comes from.
Phrases are specified with the usual double quotes "", otherwise words are search as is. Stop wording is obviously not done, which makes sense if you are providing search for words actually spoken. Unclear as to the type of indexing being used.
Advanced search provides the user with the opportunity to search for a phrase in a particular title, and to restrict search by popularity, Genre, Type (Film/TV) and language (but English is only available at the moment).
(h/t: David Thompson).