At the recommendation of @akareyon I implemented the ability for you to search by multiple authors or tags. All you have to do is separate them with a space and the search will include them. The search is set to require a post to match a minimum of one tag/author in the list in order to appear in the results. The more tags/authors that match, the higher in the results the post should appear.
Before Today's Update
After Today's Update
Thanks again to @akareyon for the suggestion. I really appreciate the feedback and awesome input.