Stop Words
By default, we ignore stop words, e.g. pronouns, articles, etc. in the queries, so that we could provide better results. For example, when someone searches "how to style my search", we would ignore "to" and "my" in the queries, because they do not have any meaning to our search.
However, it could be useful to keep the queries as they are in some situations. For example, if you run a book store, you'd want your users to be able to search for a book called "Tell Me How It Ends", without the pronouns being stripped out from the query.
Under Search Settings -> Stop Words, you can define a custom list of stop words that should be treated as meaningful terms.