Phrases in double quotes: For example, "holly dolly" returns very few results as opposed to holly dolly.
Exclusion: Terms can be excluded with -, for example windows -system (note there is no space between "-" and the excluded term).
Wildcard search: Wildcards (symbols representing unknown text) can be prefixed and suffixed, for example, the search *stan will produce results like Kazakhstan and Afghanistan.
For more details, including fuzzy search, Boolean operators, and keywords intitle:, incategory: and prefix:, see Help:Searching.
deepcategory: followed by a category name like deepcategory:Help. Use double quotes if the name contains spaces: deepcategory:"Hidden categories".
Pages with these templates
Description
Searches for pages that contain exactly these templates.
Be aware of the following
You can find transcluded templates (templates consisting of other templates).
The autosuggest function can only find templates which start the same way as your search e.g. a search for "com..." will suggest "commons" but not "nowcommons".