In Denmark on Saturday Chien from the central Quang Tri Province beat Turkish’s Semih Sayginer 40-36 over 21 innings in the semi-final.
Chien, who was playing his first world championship, then lost in the final to Sweden’s five-time world champion Torbjörn Blomdahl 40-37.
The second place finish takes him to 14th place in the world rankings.
The best finish by Vietnamese players before this year was third place last year and in 2017.