Hi coroico, thanks for your reply. While it didn't solved my problem, I did learn something new and valuable though.
Creating the specific search result template you've suggested will make all search results link to their parent resources, right? If so, it won't do the job in my case.
Anyway, I've already created a special template for those child resources, only containing a Redirectoid snippet call inside, so that anytime you try to access one of them, it redirects you to its parent:
[[Redirectoid? &id=`[[*parent]]`]]
This works great if I'm getting one result only from that specific parent resource children per search, but when I'm getting more than one, things get ugly because it's like having duplicate search results. This is what I'm trying to avoid and I thought AdvSearch is able to search inside resources' content field even if that content is actually generated by a snippet. Is AdvSearch able to do this or did I misunderstand? If not, I'll just use jQuery to eliminate duplicate search results from the page even though it's a bit of an ugly hack.