San Diego - Behind every great Americans way success story stands a united family. The Nguyen’s is an example of a hard-working Asian family that has built a thriving restaurant and food service business. Tuyen Nguyen left Vietnam and immigrated to San Diego in 1985. While studying English as a second language, Tuyen Nguyen started a small beef noodle soup restaurant known as Ph? HoaCali located on University Ave San Diego.