It is important to remember that the search page is more of a backup for those 20% of customers who didn't find the product they were looking for in the top 5 results of search-as-you-type.
A good search page, however, will allow your customers to dive deep in your product catalog. The key feature here is faceted search, also known as search filters.
Search page with faceted search filters.
Want to know more about the search function?