No, you cannot search by tags.
are commonly used in websites that support tagging
is a technique of assigning a set of string values to a particular item - such as classifying a picture of your pet dog at a photo sharing website with string tags like "dog", "pet" and so on. Tags provide an informal way for users to easily classify content and make it easy to visualize the most common tags and to drill down into a specific tag.
Here is a reference to an article
that discusses using tag clouds.
Hope this is helpful for you.
the Telerik team