Can Thi Theu must now serve 20 months for protesting eviction from her family farm, the court says.
Defendants in the case say a promise to let them go free once they returned was broken.
The women were among those who blocked Highway 1A in Ha Tinh province last year as a protest over detention of two men.
Human Rights Office for Southeast Asia also seeks an investigation into torture allegations.
Smuggled in by truck from Russia, many never make it past the border, sources say.
Nguyen Dang Minh Man’s mother hopes for her release, but doubts that her daughter will be allowed to stay in the country.
The militant group claiming allegiance to the Islamic State has been kidnapping people in the Autonomous Region in Muslim Mindanao.
Four arrests come as the Formosa chemical spill continues to be a political flash point.
Some district residents report that they are still waiting for aid deliveries from relief teams.