If you are uncertain of the spelling, you can type a '.' (a dot) to match any character, or type '.*' to match any sequence of characters (including the empty string). Every preprint will match the empty search string, so by just clicking a button will give you the complete archive (for that year).
More generally, you may use regular expressions, except for some phony characters like ();.... Those will be ignored for security reasons. This also impies that some characters are special, like $, and have to be escaped, like \$, to really search for '$'.