At least 11 people were killed and another four were injured in landslides and flooding triggered by typhoon Chanthu, which weakened into a depression in China on Friday, local agencies reported.
The northern province of Ha Giang accounted for most of the casualties with eight dead and one injured.
The remnants of the East Sea storm which lashed China Thursday also submerged hundreds of houses and streets and damaged crops in Vietnam.
Chanthu had killed three people in southern China, the AP reported.
Meanwhile, a low pressure area has formed in the north of the Truong Sa (Spratly) Islands and threatens to strengthen into a tropical depression in a couple of days, the National Center for Hydro-meteorological Forecasting said Sunday.