Nhem Soksan sat on his hammock under a shady tree in the middle of what would typically have been a work day, trying not to think about the 1,672 days he spent as a captive of Somali pirates. The 37-year-old just lazed around because he is still unemployed some three months after he and three other Cambodians were rescued from Somalia. Mr. Soksan is waiting to attend a trade school to learn to become a mechanic so he can resume…