MyOrigins never goes looking for records on its own. The interview gathers what you and your family already know; the Search page is where records get looked up, and nothing happens there until you fill in criteria and press the button.
That separation is deliberate. A conversation wandering off to search whatever it felt like produced two problems at once: results about people who merely shared a surname, and a bill for finding them. Searching from a form means the subject is always defined, which is also what lets MyOrigins throw out a record that cannot be about your person.
The more you put in the form, the better the result. A name alone will drag back every person who ever carried it. A name with a birth year, a death year and a county is a question an archive can actually answer. If a search comes back empty, loosen one field rather than all of them - drop the middle name, or widen the year by a decade, and run it again.
Each result arrives with the source it came from and, where available, a link to it. Nothing is saved to your tree until you mark it True, False or Unknown. Results the system judged to be about a different person are set aside separately, with the reason given, so you can check its work rather than take it on trust.