Searching using the site's own search engine can be very helpful. A few examples. On reddit, you can search within certain communities, not just the entire site

Searching using the site's own search engine can be very helpful. A few examples. On reddit, you can search within certain communities, not just the entire site. In addition, Google takes some time to index posts. And the internal search looks for all posts. Custom search is also very useful for showing results in the sort you want. For example, you can create a custom Amazon search for products with only 4 stars and above and sorted by price.