Foreign firms not operating in Vietnam but wishing to advertise theirs services in Vietnam must hire an advertising service provider in Vietnam.The advertisement content must be expressed in Vietnamese, except for ethnic language and internationalized terms that cannot be substituted by Vietnamese. In case both Vietnamese and foreign languages are used on the same advertising product, the foreign font size must not exceed three-quarters of the Vietnamese font size and must be placed below the Vietnamese word; When broadcasting on radio, television or on audio-visual media, Vietnamese must be read before foreign languages.