Optional subsequent parameters (up to 4) are additional search terms. They can be enclosed in double quotation marks, preceded by an unspaced - (hyphen) to exclude them from the search results, or both (e.g. -"Marilyn Monroe" to exclude matches containing the phrase "Marilyn Monroe", but not either name by itself, from the search results). You do not need to add -wikipedia, as the template automatically does this for you. Also, there is no need to add words in plural form unless irregular, as the search interface will match (for example) billiards as well given a search term of billiard.
If no parameters are given, the name of the current subpage is used as the search string. If the current subpage has a disambiguator in parentheses, e.g. Happy Birthday (Stevie Wonder song)
, then the main part of the page name will be quoted and the disambiguation text will follow, like "Happy Birthday" Stevie Wonder song
. You can specify that another title be used by using the title