What does wordpress search, search?

yes, WordPress search only searches title or post content. There are a few plugins that extend search to taxonomies, Relevanssi is one.

EDIT – The query WordPress produces for default search:

SELECT SQL_CALC_FOUND_ROWS  wp_posts.ID
FROM wp_posts  WHERE 1=1
AND (((wp_posts.post_title LIKE '%test%')
OR (wp_posts.post_content LIKE '%test%')))
AND wp_posts.post_type IN ('post', 'page', 'attachment')
AND (wp_posts.post_status="publish"
OR wp_posts.post_author = 1
AND wp_posts.post_status="private")
ORDER BY wp_posts.post_date DESC
LIMIT 0, 10

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