The search works across date, Krause listing, country, title and coin descriptions. Simply enter as much of each word as you feel necessary, select your search option and hit the search button.
You can search by any one of the words you enter. eg: the search dan ore 1938 will show you you everything containing 'dan' or 'ore' or '1938'. If you select all words then all records containing all three words will be returned. You also have the option to choose an exact phrase which as the name suggests only returns records with that exact phrase.