The pair, who had been jailed before, were convicted most recently under Article 79, a broadly worded national security law.
Vo An Don says he expects to be made an example of for posting allegations of bribery on Facebook.
The April 2016 Formosa toxic spill galvanized activists, many of whom have been jailed.
Sailor was freed from Abu Sayyaf after nine months in captivity.
Truyen's wife likens his arrest to a kidnapping and says she worries about his safety.
Vietnamese bishop from disaster-stricken coastal area visits Taiwan to compare notes with lawyers who have dealt with pollution cases involving Formosa.
His family members say they are angered by his arrest and rejected the charges against him.
Thirteen are sent back from Cambodia on Wednesday, a U.S.-based rights group confirms.
Fishing boat had cargo of slaughtered sharks, according to the Philippine coast guard.
The trial didn’t address the dispute that sparked a standoff between farmers and authorities in April.
Mud, soil and sand from a power plant will instead be used as fill in another harbor, says the Binh Thuan provincial government.
Activist Grace Bui says 13 were among 16 whose applications were rejected, while the fate of the other three is unclear.
Residents say the case is unrelated to their dispute, which sparked a standoff with authorities in April.
He is seized at home following the arrests just days before of other members of the Brotherhood for Democracy civil society group.
A furious Berlin expels a Vietnamese intelligence official and warns of further consequences after Trinh Xuan Thanh is snatched by armed men on July 23.
Rates of infection are climbing over numbers reported last year, health officials say.