A Hong Kong man has been refused entry to Australia after he was found to have been jailed for child sex offences in 2012.The Australian Border Force (ABF) said on Monday the 60-year-old man arrived at Perth Airport on a flight from Hong Kong on Saturday.The man declared on an arrival card that he had previous criminal convictions, but did not disclose his complete criminal history or the nature of the offences when he applied for an online visa, the Australian border authorities said.The ABF…