"Phim sex Chau A" is a Vietnamese phrase that means Asian porn, or literally "Asian sex films." It refers to adult films that cast actors who look East Asian. The films are often targeted toward Asians but are also sought out by those with Asian fetishes.
In Vietnamese, "phim" means film or video in English, while "Chau A" means Asian. The term Asian films usually refers to films that commonly originate or have actors who originate from East or Southeast Asia. The most popular East Asian countries are China, Vietnam, South Korea and Japan. The term often does not include other Asian countries, such as India, even though they are apart of the Asian continent.