This is the 693rd most frequent Vietnamese word.
cộng
"Combine," "plus," or "communal."
Here, 'cộng' means 'addition' or 'to add' in a mathematical context.
Em làm bài toán cộng hôm qua khó quá.
The addition math problem I did yesterday was very difficult.
In this sentence, 'cộng' means 'to combine' or 'to unite' efforts.
Mọi người cùng cộng sức để hoàn thành dự án.
Everyone joins their efforts to complete the project.
Here, 'cộng' is part of the term 'Cộng hòa', which means 'republic'.