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Does the search depends on the tags in a question or the title or the whole content of the question?
Q2A version: 1.6.3

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See qa-include/qa-search-basic.php function index_post() and function process_search().

Each word gets an ID.

Plus file qa-db-selects.php the function qa_db_search_posts_selectspec().

/* The search is performed for any of $titlewords in the title, $contentwords in the content (of the question or an answer or comment for whom that is the antecedent question), $tagwords in tags, for question author usernames which match a word in $handlewords or which match $handle as a whole. The results also include a 'score' column based on the matching strength and post hotness, and a 'matchparts' column that tells us where the score came from (since a question could get weight from a match in the question itself, and/or weight from a match in its answers, comments, or comments on answers). The 'matchparts' is a comma-separated list of tuples matchtype:matchpostid:matchscore to be used with qa_search_set_max_match(). */

Check also the db table qa_words for details.

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thanks for such a detailed answer, this is exactly what I wanted to know.
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