Help:Common words, searching for which is not possible
|MediaWiki Handbook: Contents, Readers, Editors, Moderators, System admins, Researchers +/-|
In default MediaWiki search (which is not what Wikimedia projects use), some words cannot be searched for, because they are deemed too common. The MySQL-specific list of stopwords is at https://dev.mysql.com/doc/refman/5.7/en/fulltext-stopwords.html.
To override the stopword list: https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_ft_stopword_file
If the exact title of an article is known or guessed, the Go button can be used; this feature is not affected by the above-mentioned restriction.