The advanced search feature checks all of the fields that the basic search does, as well as the description and price if the customer chooses. Customers can also narrow their search criteria by product types and/or entity, and can choose to have product pictures shown for the search results:

Advanced Search can be used on your site 2 ways:
Form
You can insert a search form into the template file (as the default skin 1 template has), along the lines of:
<form name="topsearchform" method="get" action="searchadv.aspx">
 <fieldset>
 <label>Search:</label>
<input type="text" size="15" name="SearchTerm" class="searchBox" id="searchBox" autocomplete="off"
onfocus="javascript:this.style.background='#ffffff';" onblur="javascript:this.style.background='#dddddd';" />
<input type="button" onclick="document.topsearchform.submit()" title="Click Go to Submit" id="Go" class="submit"
value="Go" />
</fieldset>
</form>
Searchadv Page
You can link directly to the /searchadv.aspx page.