The concept of 'without having to' is expressed in Thai through the phrase 'โดยที่ไม่ต้อง (dooy thîi mâi dtâwng)'. It is used to indicate that a certain action or effort is not required in order to achieve something or carry out an activity. The phrase is typically used in the sentence before the clause that describes the unnecessary action. It is a handy phrase used to simplify or streamline statements by removing unnecessary details or actions.