To access the Advanced search feature in Plone you must append search_form to the end of your web address (i.e. http://www.mysite.org/search_form). You should then see a page titled Advanced Search with a variety of criteria fields available.

There are a number of ways to creatively filter search results with the criteria of the Advanced Search form. Some of the most useful ones are:

• Search Text searches the Title, Description, and Body of content items. Leave blank if you don't want to filter based on search terms.
• New Items Since filters results based on the creation date. This is very useful if you want to see what content has been recently created on your website.
• Item Type allows you to select the Content Types you wish to include in the search.
• Author filters results based on a particular user. You need to know the username of the person you wish to find results for.
  
• Review Status refers to the Publishing State of the content items. For example, you can restrict search results to include only Published or Private items.

You can apply several of these criteria to a single search. For example, if you wanted to find all published News Items on your site that contain the word "Climate" you would do the following:

1. Type "Climate" into the Search Text field
2. Select only News Item from the Item Type checkboxes
3. Select only Published from the Review Status checkboxes
4. Click Search at the bottom of the form