The default search operation is AND among multiple search terms. Also word stemming is an option in advanced searching. Several means are available to narrow down large search results to manageable proportions. Searches can be limited by date, language, special media types, or words in page titles. One other, unique, limit is the Page Type limit, with choices of Any, Top Page, Personal page, or Page Depth.
Top Page can be very useful for identifying a primary site for an organization or topic.
Page Depth requires a number, with the default of 3, that will limit how far down a subdirectory hierarchy HotBot will display results. Searches in all lower case will retrieve all results. Results are sorted by relevance. Top 10 results are determined using clickthrough data, that is the frequency with which sites are chosen by users in search results. The default display is 10 records at time, although you can request displays of more at a time, and less information per record.