Database Exploration(blog)

We evaluated the database today. We checked, ABC CLIO, Grolier Online, Sirs Research, Gale, Ethnic Newswatch and some other ones. If I were a science or history teacher I would definitely use these databases but I noticed that there are not enough information on Japanese subjects. If the research topic is something worldly famous you can find information on that easily, but if you are looking for something very Japanese and not that well known, it is very difficult to collect data by using only the database listed on that page. Am I missing something?