1. All phrases if you can read my post
2. With better knowledge of your search function your correct reply should be:
"In addition, words that are present in 50% or more of the rows are considered common and do not match."
That's why "another" is not found and no matches are found when there is only 2 posts in the Forum
Read for more info here
http://dev.mysql.com/doc/refman/5.6/en/fulltext-search.html
and don't refer to another post where there is a link to Google