You can enter several search terms, both those that are to be included in the page (+ in front of the word)
as well as those that should not appear on the page (- in front of word)
You can also create combined search terms by using quote marks around two or more words
Example: +Reykjavík -Ísafjörður
Example: +"Jón Jónsson" -"Jóna Jónsdóttir" 
Note that if you have unmatched quotes (example: "Jón Jónsson), nothing will be found.