THE Bureau of Immigration (BI) has ordered a tighter screening process of Vietnamese entering the country to ensure that they were not recruited to illegally work here by a human trafficking syndicate. Immigration Commissioner Jaime Morante issued the order on Tuesday after the surrender of 78 overstaying Vietnamese who admitted working in the country for the past two to three years without valid documents. Airport immigration officers will thoroughly screen arriving Vietnamese to ensure they have valid and legitimate purposes in traveling to the Philippines. Those who could not satisfactorily explain their travel purpose should be refused admission and be loaded on the next available flight back. BI spokeswoman Antonette Bucasas Mangrobang said the Vietnamese worked either as househelpers, vendors, porters or carpenters and deployed to the provinces of Cagayan, Pangasinan, Bataan, Zambales, Batangas and Leyte.