Eval content displayed via snippet

Hey,
How can i eval some content that have i displayed from some snippet via echo or return command?
I need from the snippet call "get_content" get the content of doc, but i would like to put in the content some snippets. The snippets calls are displayed as a string, not evalued :/
Thanks for any suggestions.
PS: Sorry for my Eng

See this:
http://modxdeveloper.com/blog/the-wrapper-snippet-run-a-snippet-from-within-another-snippet

//or this http://modxcms.com/forums/index.php/topic,36235.msg218841.html#msg218841

Hey,
I cant figure it out how to use the "@DOCUMENT" (link)and where to use it :/
The "runSnippet()" (link)function wont work for me i think, becouse i havent got a snippet name - i would like to parse hole document with all snippets in :/

No, the runSnippet() function won’t do that. If you use a TV with the @DOCUMENT binding it will.
http://sottwell.com/tv-bindings.html