For all it's charms, DDG seems to be tailored to answering the kinds of questions that are most likely to be asked. IME, it's not well-suited to detailed dives

For all it's charms, DDG seems to be tailored to answering the kinds of questions that are most likely to be asked. IME, it's not well-suited to detailed dives into a narrow (likely unpopular) topic. If the first page doesn't satisfy, just prefix the search terms with '!b ' and Bing usually nails it.