I'm confused by your question -- "can I specify the result of the simple search?" -- do you want to change the
format? Or the actual result?
If you want to change the format, you need to specify a &tpl argument in your Snippet call, e.g. create a Chunk named "myChunk"
<div class="sisea-result">
<h3>[[+idx]]. <a href="[[~[[+id]]]]" title="[[+longtitle]]">[[+pagetitle]]</a></h3>
<div class="extract"><p>[[+extract]]</p></div>
</div>
And then reference it in your Snippet call:
[[!SimpleSearch? &tpl=`myChunk`]]
That's just an example. The other arguments available are here:
http://rtfm.modx.com/display/ADDON/SimpleSearch.SimpleSearch
But without knowing how you've structured your data, it's impossible to give you a specific answer. Your example there has "category" and "brand_name" -- are you making TVs for those? Or are you structuring your pages so the parent folder is a category? There are many different ways you could do this.
It doesn't look like it provides a count of how many records were matched in the search -- that would take a separate database query, so I can understand why it's omitted.
Bottom line is that searching is subtly complicated, and unless you have a really good reason for it, it's much easier to leave it to Google. (Usually people ignore that advice, then waste many hours of their lives, then often they come back to Google... that's just my observation).