How to build better filtering experience. Yelp's approach  http://engineeringblog.yelp.com/2015/12/how-we-made-yelp-search-filters-data-driven.html

Короткий але гарний і повний огляд питань, які можуть виникнути при проектуванні якісного пошуку

Let's not forget that search is a collaboration between human and machine. As the late Doug Engelbart said, the most effective way to solve problems is to use computation to augment human intelligence. In other words, the best search engines are those that help users help themselves.

https://www.oreilly.com/ideas/beyond-algorithms-optimizing-the-search-experience