Make content included with Include Topic Description retrievable by search

If I create an article with a particular keyword, let's say FOO, and include it in another article using the {% include_topic_description your_topic_id %} tag (as described on http://feedback.userecho.com/topics/8248-how-to-include-an-article-content-into-another-article/) and then use the knowledge base search feature to search for FOO, only the original article will be retrieved. If instead of using the include tag, I had manually copy-and-pasted the text then of course it would be retrieved by the search feature.

I would like to create shared hidden articles with common boilerplate text, e.g. installation instructions, that are included in other articles for specific products. It would be great if I could search for text included from the shared article as well as the specific article and be directed to the most relevant article.