The Vietnamese word "lưu niệm" can be translated to English as "keepsake" or "souvenir." It refers to something that is kept or cherished for memory or remembrance, often given as a gift to help someone remember a special occasion or person.
While "lưu niệm" primarily means keepsake or souvenir, in some contexts, it can also imply the act of remembering or commemorating an event, such as "lưu niệm ngày sinh nhật" (commemorating a birthday).