Trivia and goofs should be searchable

You can search trivia/goofs and many other sections already using advanced search at -- please see the help guide at https://help.imdb.com/article/imdb/discover-watch/using-the-advanced-search-feature/GLUEUYWPQNPTEVPU and specifically "Searching using topics"

For the use case of searching within a specific title's trivia/goofs for duplicate words / phrases, you can use your browser's built-in page search feature. 

Hope this helps.