The Vietnamese word "cây bút" translates to "pen" in English. It is commonly used to refer to a writing instrument that you use to write or draw.
In literature or in discussions about writing, "cây bút" can refer not just to the physical object (the pen) but also to the act of writing itself or the skill of writing. For example, when discussing an author's style or effectiveness, you might say: - "Cây bút của anh ấy rất sắc sảo," meaning "His pen is very sharp," implying that his writing is insightful or clever.