there are some source and the questions :
http://www.asian-nation.org/vietnamese.shtml
http://www.latimes.com/world/asia/la-fg-vietnamese-americans-return-20150430-story.html
http://www.migrationpolicy.org/article/vietnamese-immigrants-united-states
http://time.com/4034925/vietnamese-refugees-united-states-history/

the Outline is required also