This is a line I came across in someone's bio. Apparently the author is not a native speaker of English.
Since 2005 I have extended my research on education to the German society.
I am under the impression that an article should not be used when referring to a country's society collectively. Google search results show that most journalistic writings do not use the definite article before a nation's collective public, i.e. "German society", "Chinese society", "Japanese society". There are some search results on Google Books and Google Scholar that have the definite article before a nation's society, but I am not sure they have been authored by native speakers of English.
Should there be the definite article in this case?