TAIPEI, Feb 26 : The yen clawed back strength against the U.S. dollar during the Asian trading session on Thursday, while better-than-expected earnings from Nvidia boosted investor confidence and markets awaited details of the latest U.S. tariffs on imports of foreign goods. The yen was last 0.3 per cent stronger against the dollar at 155.87 yen, regaining some lost ground after hitting its weakest levels in two weeks, as comments from Bank of Japan officials steadied the Japanese currency. The