求翻译：已有文献对大学毕业生就业问题的研究主要是从社会学、教育学角度进行，从经济学角度研究较少，其中基于外商直接投资角度的研究更加缺乏是什么意思？

Existing literature on the employment of university graduates, mainly from sociological research, education point of view, few studies from an economic point of view, which is based study of foreign direct investment point of view is more a lack of

There is literature studies on employment issues in the university graduates are mainly from the sociological perspective, the study of education in terms of economics, research-based, which is less direct foreign investment perspective more lack of research

Had the literature to get employed the question research to the university graduates mainly is from the sociology, the pedagogy angle carries on, are few from the economic angle research, in which is more deficient based on the foreign direct investment angle research

Documents on the study on employment issue of college graduates was mainly from the perspective of sociology, education, from an economic point of view less, based on the study of foreign direct investment more lack

Had the literature to get employed the question research to the university graduates mainly is from the sociology, the pedagogy angle carries on, are few from the economic angle research, in which is more deficient based on the foreign direct investment angle research