Requested via email, an example is Chinese characters result in "not found" lookups, e.g.
Beijing 北京
Peiking University 北京大学
Tsinghua University 清华大学
Beijing Normal University 北京师范大学
Looks like a culture code is required in the Bing Maps API request. Should also confirm proper param encoding too. See https://social.msdn.microsoft.com/Forums/sqlserver/en-US/e1bb97c8-692c-4ce2-b642-99c213e001be/does-bing-map-api-support-chinese-character-query?forum=bingmapsservices