Datuk Azharuddin Abdul Rahman says planes searched the location Thursday. "There is nothing. We went there, there is nothing," he told reporters in Kuala Lumpur.
Vietnamese officials previously said the area had already been "searched thoroughly" in recent days.
The hunt for the Boeing 777 has been punctuated by false leads since it disappeared with 239 people aboard just hours after leaving Kuala Lumpur for Beijing early Saturday.
The plane was heading east over the South China Sea when it disappeared, but authorities believe it may have turned back and headed into the upper reaches of the Malacca Strait or beyond.