The legislation would add stiffer penalties to an already harsh penal code, the group says.
Thich Quang Do thanks supporters who recently called for his release from house arrest.
Fisherman Dao Ngoc Duc says he cannot afford to buy new nets and continue his livelihood.
Motorists say owners regularly fix their meters to scam consumers.
Tran Vu Hai was nabbed as he was heading to Hanoi’s police headquarters to discuss the case and the related harassment of two attorneys with authorities.
They are inspired by Myanmar’s rapid reforms and question the pace of change at home.
Police pulled Tran Minh Nhat and Chu Manh Son out of a car as they traveled to their home village.
Xi Jinping did not mention the two nations’ tussle over the Paracel and Spratly islands during his speech to Vietnam’s parliament.
Police beat and detain protesters in Hanoi and Ho Chi Minh City.
The lawyers believe they were targeted to dissuade them from taking the case.
They want to call attention to China’s aggressive moves in the South China Sea and its brutal treatment of Vietnamese fishermen.