Site name is case-insensitive. Output format You can specify, what output format you prefer for the search results, whether you want to open links in new window and number of results per page. Sort by Relevance - calculated for each document as function of words entered in Keywords field. Words in 'Additional boolean expression filter' field do not affect relevance criteria. Date - document date.
Group results No group - default.
Group by site - shows documents belonging to the same site together. Site with the best document is displayed first. Meaning of 'the best document' depends on selected sort criteria - it is either the most relevant document or the most recent document. Show only the best result for each site - shows only the best document for each site. Site with the best document is displayed first.