This is a technical support forum for posting specific technical issues and getting help with them.
Here are some ways to find other blogs of interest to you.
The Tags search page is in the Reader area of the Dashboard is at this link. http://wordpress.com/tags/
The WordPress.com search engine indexes post, pages, and comments content (body text). Unless entered as text in those contents, blog name, post titles, and post/comment author names are not indexed. http://en.support.wordpress.com/wordpresscom-search/
For Topics (Tags page) searches see http://en.support.wordpress.com/topics/ This is the syntax http://en/wordpress.com/tags/canada
See here http://wordpress.com/#!/read/topics/
For Google searches use this format and replace "keyword" with whatever word or keyword phrase you wish:
Example search string
Queen Victoria site:wordpress.com
results > http://tinyurl.com/csaobsx