Canon is no longer building or expanding factories in China, but the company is doubling its work force at a printer factory outside Hanoi to 8,000. Nearby, Nissan is expanding a vehicle engineering center. Hanesbrands, the underwear company based in Winston-Salem, N.C., is setting up two new factories here, as is the Texhong Textile Group from Shanghai. China remains the most popular destination for foreign industrial investment in the world, attracting almost $83 billion last year. But a growing number of multinational corporations are pursuing a strategy that companies and analysts call “China plus one,” establishing or expanding Asian bases outside China; particularly in Vietnam. A long list of concerns about China is feeding the trend: inflation, shortages of workers and energy, a strengthening currency, changing government policies, even the possibility of widespread civil unrest someday. But most important, wages in China are rising close to 25 percent a year in many industries, in dollar terms, and China is no longer such a bargain. Even as companies seek other places to make their goods, they are stalked by overheated economies: in Vietnam, for example, inflation was 25.2 percent last month. More than corporate profit margins are at stake. When the cost of making goods in Asia rises, American consumers inevitably feel pain. The Labor Department said Thursday that import prices were 4.6 percent higher in May than a year earlier for goods from China and 6.4 percent higher for goods from southeast Asia. Companies are using the China-plus-one strategy to mitigate the risks of overdependence on factories in one country. Multinational corporations are “thinking about all the world and keeping a balance” between China and other countries, said Edward Kang, the chief executive of Ever-Glory International, a sportswear manufacturer in Nanjing, China. Ever-Glory, which sells to Wal-Mart and Kohl's, is building a factory in Vietnam. Companies remaining in China are desperately seeking to control costs. “We will maintain our capacity in China, but we will make it more automatic and reduce the number of employees,” said Laurence Shu, the chief financial officer of Shanghai-based Texhong, one of the world's largest makers of cotton and spandex fabric. To limit labor costs, Hanesbrands is building a largely automated factory in Nanjing. But the company is also building a factory in Vietnam, in addition to a factory it bought here, and two more in Thailand. Gerald Evans, the president for global supply chain at Hanesbrands, said that compared with China, “we found more ready availability of both land and labor in both Vietnam and Thailand.” Hanesbrands will be shifting some manufacturing from Mexico and Central America to Asia. In China, where rural villages are running low on able-bodied young workers to send to factories, wages are rising more than 10 percent a year for many assembly-line workers. And pay is rising even faster for skilled workers, like machinery repair technicians. In coastal provinces with ready access to ports, even unskilled workers now earn $120 a month for a 40-hour workweek, and often considerably more; wages in inland provinces, where transport is costlier, are somewhat lower but also rising fast. While Chinese wages are still less than $1 an hour, factory workers in Vietnam earn as little as $50 a month for a 48-hour workweek, including Saturdays. Texhong estimates that average labor costs for each textile worker in China will rise 16 percent this year, including increases in benefits costs — on top of a 12 percent increase last year. New regulations are making it harder for companies to avoid paying for benefits, like pensions, further increasing labor costs.