Jolie has previously visited Pakistan, Sierra Leone and Namibia

Jolie is a goodwill ambassador for the United Nations, and filmed Lara Croft: Tomb Raider in Cambodia after winning an Oscar for her role in Girl, Interrupted.

She flew by helicopter to the Tham Hin camp, west of Bangkok, to visit thousands of refugees from the neighbouring country of Myanmar, formerly known as Burma.

"Having been to these camps, I've never been so nervous that a film does justice to the people involved," she said.

"My heart's more for here than the film business."

Her next film, Beyond Borders, has been criticised for the way it portrays people in Asia and Africa in the 1980s.

It makes perfect sense to go to an orphanage and find a child that needs a home

Angelina Jolie

Jolie put on a traditional ethnic dress given to her at the camp, which is home to 9,000 people, mainly from the Karen minority.

"I'm always surprised by the people," she said. "They seem very happy with what little they have.

"But obviously, as human beings and after what they have been through - they should have more."

Jolie also donated a television, a video player, sports equipment and more than 4,000 sarongs - one for every woman in the camp.

Adopt

She is married to actor Billy Bob Thornton, and has previously visited Pakistan, Sierra Leone and Namibia.

"I would love to adopt another child, from wherever there is a need," she told reporters.

"My husband's nervous every time I go to another country.

"For me it makes perfect sense to go to an orphanage and find a child that needs a home."