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Not an expert on this but Google will crawl and index these dynamic URLs if they are being used (generated by user query) a lot. Here are some methods you could use - 1. Link building for these dynamic URLs - You could do some link building for all the combinations of filters (dynamic URLs. This could be time consuming but well worth. Ideas for link building includes - press releases, blog posts (if you have a blog then can you do internal linking), business directories (if your business has got a physical store then you can create business listings and mention your products strategically (dynamic URLs) etc. 2. Update .htaccess file - Maybe there is a way to set canonical for some URLs to your preferred dynamic URLs. - Okay, as I said I am not an expert on this so I am just throwing this idea out there for if someone is aware of a way.

Thank you, great answer.