How to search by taxonomy terms I created a taxonomy called tags.  I added terms to the vocabulary list.

Then I created a content type called News Item.   You can apply tags to News Items.

I created a view to list News Items.

How do I set up a search box that let's people search News Items by tags?  they should be able to search by multiple tags.  So if the search words are "tutorial learning-resource", then show all news items that have both the tags tutorial and learning-resource.

How do I do this?
If I understand well, I think that you can do this with Views, so you can expose a filter related with Taxonomy: Term ID related with your Vocabulary. Remember that you can use the operator 'Contains' if you want to be more laxed in the search.