News that HR consulting firm Mercer forged a deal with an executive search firm in Vietnam is a sign of the times.

U.S.-based firms that pitch talent-related services see strong growth in Asia even as evidence keeps pointing toward a downturn in the U.S. economy.

Mercer, a unit of professional services firm Marsh & McClennan Cos., said Thursday, March 14, that it signed an agreement with TalentNet of Vietnam to market and provide Mercer’s proprietary research, HR management tools and survey data.

Guo Xin, deputy region head of Mercer for the Asia-Pacific region, said the agreement with TalentNet further underscores Mercer’s ongoing commitment to expanding in Vietnam.

“With Vietnam experiencing such phenomenal growth in the past years, so too has demand for Mercer’s offerings, particularly with data-driven products and services from our Information Product Solutions (IPS) division,” Guo Xin said in a statement.

I met with Guo Xin last year in Beijing  and heard him say similar things about China’s rapid growth and the accompanying demand for HR-related help.

Mercer is not alone in jumping on the Asia bandwagon. Right Management, the consulting firm that’s a subsidiary of staffing giant Manpower, last month announced new positions for two executives in Asia.

And executive search specialist Korn/Ferry International saw its executive recruitment fees  in the Asia-Pacific region jump 36 percent in the three months ended January 31, to $25.3 million.

That was a much faster clip than the 21 percent growth overall in the firm’s executive recruitment fees. What’s more, those Asia-Pacific placements had a higher profit margin—21.5 percent—than Korn/Ferry’s executive recruiting gigs in North America, Europe and South America.

But how long will Asia be golden? A big question right now is whether China, Vietnam and other Asian countries can avoid catching America’s economic cold. There’s some thinking the slowdown at hand will be fairly global in nature .

If that’s the case, all the diversification in the world may not do much to help U.S.-based talent advisors weather a rough patch.