Tecnical and Design Discussion: How to implement a search bar which makes it easy for users to search multiple tags

In the new design proposal below, you’ll see it has prominently features a search bar and guides users to common tags they are likely to want to search (until they become familiar with the system)

Users in the forum have been increasingly using the search bar to find things ahead of the structured approach we began with, as it works far better with the tag-page approach we switched to.

There will often be times where searching multiple tags is desired, which is possible in Discourse, but kind of hidden. In our forum we’re going to want that to be something easily accessible to users. As a quick example, this post is in ‘ux’ and ‘ruby-on-rails’. If a user has both skills they might want to see where they can apply both together.

How can we combine that into the search bar?