In web search sometimes users search with a query which covers a broad set of concepts or categories. In the context of e-commerce, such queries may cover a broad range of products. Typically, a search engines best strategy to deal with such broad queries can be to provide a diverse set of results optimally covering these various concepts or categories. There are no dearth of academic studies on classification of queries. I have recently noticed that Amazon's product search is not giving very good results for quite a few popular broad queries.
Here are a few example:
Query: Mac
Query: Foundation
Here are a few example:
Query: Mac
Query: Foundation
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