These steps come from Craig Lussier.
The URL convention for filtering by multiple tags is as follows:
http://social.technet.microsoft.com/wiki/contents/articles/tags/[tag1]/[tag2]/[tag3]/default.aspx
Where you replace [tag1], etc, with the URL encoded value for the tag.
The previous recommendation used to be to use the following URL for tag seaches:
http://social.technet.microsoft.com/wiki/tags/[tag1]/[tag2]/[tag3]/default.aspx <=== Do NOT use this form
This short form (without the string "/contents/articles") will produce results, but it has been discovered that the results are incomplete. Not all articles with the tags are found. It appears that 2 or 3 articles per page are missing.
This bug has been reported here: http://social.technet.microsoft.com/wiki/contents/articles/2368.wiki-known-issues.aspx#Tag_search_results_can_be_incomplete.
So that means if I want only articles that contain the "pt-BR" and "SQL Server" tags, then I use this URL:
http://social.technet.microsoft.com/wiki/contents/articles/tags/pt_2D00_BR/SQL+Server/default.aspx
Note the following symbol changes:
That means I use the "en-US" and "SharePoint" tags:
http://social.technet.microsoft.com/wiki/contents/articles/tags/SharePoint/en_2D00_US/default.aspx
That means I use the "PowerPivot", "Excel", and "Known Issues" tags:
http://social.technet.microsoft.com/wiki/contents/articles/tags/PowerPivot/Excel/known+issues/default.aspx