Download where title contains term

[cosmosfood]

Let's say I want to download results from r/pics that have the term "sunset" somewhere in the title. Here's what I've (unsuccessfully) tried:

bdfr download "<folder>" --subreddit pics -L 15 --no-dupes --file-scheme "{DATE}__{REDDITOR}__{TITLE}__{POSTID}" --disable-module Imgur --search 'title:sunset' --sort relevance

and

bdfr download "<folder>" --subreddit pics -L 15 --no-dupes --file-scheme "{DATE}__{REDDITOR}__{TITLE}__{POSTID}" --disable-module Imgur --search sunset --sort relevance

How do I do this correctly?