Four domestic airports and part of the national highway were closed on Monday. More than 180 flights have been cancelled or delayed, airport authorities said.
Parts of Nghe An and the steel-producing central province of Ha Tinh were without power, and schools were closed in affected regions.
Since making landfall in Vietnam, Bualoi has weakened as it moves towards neighbouring Laos.
The storm battered small islands in the centre of the Philippines last week, killing at least 11 people and forcing 400,000 to evacuate.
In Vietnam, 175 people were killed or went missing due to natural disasters from January to August this year, the General Statistics Office (GSO) said.
Total damages were worth about $371 million, almost triple the amount of the same period in 2024, the GSO said.
Scientists warn that storms are becoming more powerful as the world warms due to the effects of human-driven climate change.
Typhoon Yagi killed hundreds of people in Vietnam in September last year and caused economic losses worth $3.3 billion.
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