Allow to limit search results by word or page count, or a document length range
This should get rid of minor articles such as might appear when searching in newspapers. Also, it might help in further weeding-out book reviews. Plus, there are times users want articles that discuss an issue in-depth and they don't want a 2-page article from some journal. Conversely, I've helped users who get huge articles from journals who would like to find articles that are just 3-4 pages in length, etc.