Even though this information is about B (i.e., tourist and business) visas to the US, it may offer some insights into trends related to the issuance/refusal rates for student visas. You can assume that, in most cases, the refusal rates are higher. Below are the B visa refusal rates for the top ten sending countries for US-bound international studens, using SEVIS (Department of Homeland Security) data from March 2012:
S. Korea: 7.5%
Saudi Arabia: 6.3%
Aside from Canada, whose high refusal rate is explained below, and India, whose population is 12 times larger than Vietnam’s (i.e., sheer numbers), Vietnam has the highest refusal rate. Here are the rates from 2006-10:
The average among all countries except Canada is 14%. The likely reason why Canada’s refusal rate is so high is that there are a lot non-Canadians applying for visas at the US diplomatic posts in Canada. (Canadians don’t need a visit to travel to the US.)
This information for every country whose citizens visited the US as tourists or on business is available on the US State Department’s website (PDF).
Stay tuned for another post about Vietnam-US immigration. Can you guess what place Vietnam ranked in this category last year? My post will provide information from a 10-year period; the results may surprise you.