Manual:$wgSearchRunSuggestedQuery

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<translate> Search</translate>: $wgSearchRunSuggestedQuery
If search returns zero results and current search engine has a "did you mean" suggestion, results for the suggestion will be shown.
<translate> Introduced in version:</translate>	1.26.0 (Gerrit change 244100; git #0379e466)
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	(boolean)
<translate> Default value:</translate>	`true`
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

If search returns zero results and current search engine has a "did you mean" suggestion, results for the suggestion will be shown.