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This was explained in the article. If some results for keywords "A B C D" do not exist in the results for keywords "A B C", then you know these results have bee

• tagawa 10y ago
  That doesn't seem like a practical solution. One keyword can change the expected search results dramatically, for example: "red ford mustang" and "red ford mustang toy", "wall street 2015" and "wall street 2015 protest", "photos of jam" and "photos of jam jars", etc. In some cases there may be overlap but a lack of it doesn't necessarily indicate censorship.
• NotSammyHagar 10y ago
  Web search isn't that simple. The search engine does more sophisticated work than that. For example, if no one ever clicks on abcd results, it wont show them when you search for abc.