The best alternatives to SoProSearch are Infoscope, Funnel Search, and Hashfinder. If these 3 options don't work for you, we've listed a few more alternatives below.
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Enjoy looking at the most advanced Google Search Tool. You can use Infoscope to customize and visualize your searches in Google, each search is represented by a set of nodes, each representing a specific operator!! https://www.frankemiro.com/infoscope
Perform targeted oriented search queries with Funnel Search Restrict your results with various search operator, which shows the most relevant results for you.
Hashfinder is the Search Engine for the social web. It's a place where you can discover popular posts via hashtags, find out what topics are hot on Twitter, Youtube, Reddit, Tumblr, and more.
When you search for something on Occamm, it suggests keywords along with the results, which you can then select to refine your query further.It is especially helpful when you are researching something. And Occamm is completely privacy friendly.