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 mus

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.