DOMESTIC HELPER VISA

I have a friend in HONGKONG he works in a printing press for the last 20 years
He went as a domestic helper.still he works with the domestic helper VISA Every TWO years he comes to his family.He said that he can find me job there.My question is if i come with a HOLIDAY VISA can i sign a Gob contract with .a employer and come back to SRILANKA to get the domestic helper
visa.my age 46,Srilankan,very good in English, Please Explain