Try: keyword searches relevant to your topic. Ex. (draft or military) and (Japanese americans)
Look at the subjects for a book that is of interest to you. Follow the subject links to more resources on the topic.
Examples:
Japanese Americans -- Evacuation and relocation, 1942-1945.
Community Newspapers and the Japanese-American Incarceration Camps
The Color of Success - Asian Americans and the Origins of the Model Minority
After camp : portraits in midcentury Japanese American life and politics
Prisons and Patriots
Nikkei Baseball
Desert Exile: The Uprooting of a Japanese American Family
Taken from the Paradise Isle: The Hoshida Family Story 1912-1945
The Hope of Another Spring:Takuichi Fujii, Artist and Wartime Witness