None of them make an attempt at filtering this. While I found it amusing because they advertise with AI magic in other areas, those search engines all advertise to be keyword searches and one of them being "the worst" means it's either random (since none of them are trying) or they are the best (since it matches the stripes keyword).

To be honest I wish they actually were keyword searches and that the machine doesn't try to be smarter than you. Many times when I carefully specify which keywords must appear on the page, it'll ignore parts of the query or add unrelated synonyms. Usually one can work around it with operators but it's tedious and doesn't work reliably.