Hanoi, July 9 -- National flag carrier Vietnam Airlines will increase frequencies on several routes to Japan, the Republic of Korea (RoK) and Taiwan (China) to meet rising demand for tourism, business and family visits between Vietnam and Northeast Asia. The addition forms part of the airline's strategy to strengthen connectivity in high-demand international markets by increasing frequencies on existing routes and offering passengers greater flexibility in flight schedules. From Hanoi, the airline will raise the frequency of its Hanoi - Taipei (Taiwan) route from seven to 11 flights per week. The Hanoi - Osaka (Japan) route will also see 11 flights per week, from seven, between October 26 and November 30, before increasing to 14 from Dece...