As Vietnam industrializes and the trade market from China filters into the country, Charles acknowledges the changes that have taken place.
"The very fact that Anh was allowed to leave the country shows how far they have come," he said.
Not only is Charles learning from his Vietnamese daughter, she is also understanding parts of her country's history from another source than a textbook.
"It is hard for me to understand what it was like," she said. "I have read about it in books, but it was a long time ago. My father was still an infant during the war."
Charles also learned of the reputation that America left in Vietnam in the wake of the war.
"It is interesting that young people in Vietnam hold more animosity towards the French Indochina War than they do towards the Vietnam War, which happened earlier," he said.
The Minke family has accepted Pham into their family and spoke about their interest in visiting her when she returns to Vietnam.
"I would love to go back," said Charles. "And now I have a reason to. Her family must be a fine one to have raised her and I would really like to meet them."