You should separate multiple parameters with &, so it would be:
<a href="blog.php?id=<?php echo $row_rs_blog['blog_id']; ?>-&title=<?php echo $row_rs_blog['blog_url']; ?>">
The recordset you created has a SQL injection vulnerability. It should be:
$query_rs_blog = sprintf("SELECT * FROM tbl_blog WHERE blog_id = %s AND blog_url = %s", GetSQLValueString($colname_rs_blog, "text"),GetSQLValueString($urlTitle_rs_blog, "text"));