Even Bing shows about 1/3 mixed race couples as "white couples". Until recently Bing actually gave results that were close to what you asked for. Google had a fat white chick with a black dude included in the mix. SearX.mobi showed the same fucked up pictures as the other search engines. Searx.me was pretty clean, with images that closely matched the query. I wonder why the two seearx sites were different..