You should be able to get all the questions containing a particular word with a database query like this:
SELECT p.postid, p.title
FROM qa_posts p
INNER JOIN qa_contentwords c ON p.postid = c.postid
INNER JOIN qa_words w ON c.wordid = w.wordid
WHERE w.word = '...' AND p.type = 'Q';
Note, however, that "google cloud" are two words not one, so you may need to adjust the query to take care of that.
With the post ID and title you can then construct the path to each question like this:
$q_path = qa_q_path($id, $title);
where $id is the post ID of the question and $title is its title (as returned by the database query).
Related. Also related.
