Rights groups offer to help Oyadao's `jungle woman'

Sal Lou said that despite not speaking, she has begun to understand his own hill tribe language of Phnong.

"When we talk to her she understands, but she cannot reply to us. This is because she has forgotten the language, she has not spoken it for a long time," he said.

"She follows what we tell her to do. When we tell her to sit, she sits," he said.

"So, sooner or later, she will know how to speak," he said.