I'm not saying that you don't use word order. I think you must to some extent if you are doing a comprehensive semantic analysis of the keywords and websites. I'm saying that your users may not use correct word order because they are lazy and because they are used to the behavior of search engines that don't require it but still give okay results.

Perhaps you have solved this problem, but I just don't see how you can offer better results than Google on average (without having a similar sized index) when users are just throwing together a bunch of words related to what they are looking for. It seems to me that if we want to take advantage of systems like yours for search and if we want to get better results than Google, we need to change users' behavior; they need to learn to give more precise queries.