The phrase 'โดยไม่เว้นแต่ (dooy mâi wêen dtàe)' is used in Thai language to indicate that something applies to every member of a group without exception, similar to the English phrase 'without exception'. It is typically used in formal, written Thai and is considered a bit more formal or literary in tone. It is often used in combination with plural nouns or pronouns. It clearly illustrates that the speaker means every single one of a group or category.