My thanks to Klaus Graf. For a German-language blog post complaining about the lack of interest in making a good OA search engine, he has obtained and shown a screenshot of two results from OAFindr (by 1science aka One Science) for mongolian folk song. These keywords were used for my December 2015 group-test of OA search engines.
Neither of the two OAFindr results is in JURN, because they both come from a title published by the Canadian Center of Science and Education, a publisher which has long been on Beall’s List.
Update, Nov 2017: OAFindr is now called 1Findr.
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A little bit more info about the mysterious oaFindr. oaFindr = records and live Web links only, according to their own marketing pitch…
Admittedly that was 2015, but a Twitter comment from an official account in summer 2017 suggests it has grown somewhat to “25M”.
Thus it sounds like the oaFindr is not searching against real full-text, but searching against records and (possibly, when available) abstracts.