Chien was one of three host players in the quarter-final round of the men's three-cushion carom event.
He defeated teammate Nguyen Quoc Nguyen, the Southeast Asian Games winner, 3-1 for his semi-final berth.
This means he will be the Vietnamese representative at the world tournament in Portugal on September 5-9.
In the semi-finals, Chien was beaten 1-3 by powerful rival Takeshidafrom Japan – but this does not cost him his berth. Takeshida tookthe second berth to the world tournament.
Meanwhile KimKyung-roul of the Republic of Korea defeated Japanese RyuujiUmeda 3-0 in the other semi-final to enter the final of the AsianChampionships.
The World Billiards Union said there werefour world championships' positions given to Asian players. Both Kim andUmeda acquired their positions at previous tournaments. ThereforeVietnam, with two athletes presented in the quarter-final round, stillhave a chance for another berth at the world championships with two morepositions are available to high ranking competitors from the Asianzone.-VNA