With that as the starting point, your book's ranking depends on how well it is selling at any given point in time, and how many other books are competing for the same search terms (book title, subtitle, keywords, etc.). (authorimprints.com)
When using each of six different legal research databases, the search algorithms were given the same search terms to find cases in the same jurisdictional case database. (2civility.org)
For example, various legal research providers all yield dramatically different results when given the same search terms. (2civility.org)