[Plugin: Simple Tags] Tag page results

Hi,

Then I click on a keyword tag on the page it goes to the following link:
http://www.website.com/tag/medicine/

The tag page results it’s show me the whole article from the pages. How can I reduce the number of words per each results ?

Then I do a simple search (/?s=analize) it’s shows only a few words, not the hole article of that page.

Thanks

http://wordpress.org/extend/plugins/simple-tags/