you can make a filter over fanfiction as follow: needle => contain needle ~needleA ~needleB => is needleA or needleB -needle => doesn't contain needle char:harry => have character named harry pair:harry/hermione => have a pairing of harry with hermione kudo:>1000 => have more than 1000 kudos chapter:1 => has exactly 1 chapter bookmark:5 => has been bookmarked exactly 5 times comment:>50 => have more than 50 comments hit:>10000 => has more than 10000 hits words:>3000 => have more than 3000 words updated:>2months => have been updated before 2 months ago is:complete => is complete is:f/f => has lesbian relationship is:m => has mature rating fandom:firefly => is of the firefly universe is:crossover => is a crossover tag:searchtag => has a tag containing "searchtag" lang:english => is in english