I didn't know it when I saw it. Later, I asked a friend who was learning Vietnamese, which probably meant "itchy hands are because of tinea, itchy feet are because of tinea" and so on. The lyrics at the back directly sang "King Pikang has come, which has brought me a happy life ...", and my friend said that as soon as I heard the lyrics, I knew that this was an advertisement for King Pikang, and King Pikang was a skin medicine in China.