Volunteering in Asia forum

Hi,
I am leaving in January to travel solo for the next 6 months. I am looking for free and reputable volunteer organizations in Thailand, Vietnam, and Indonesia. I have a lot of experience with leading and participating in various volunteer or service work. I am looking for environmental organizations, children, and community development. I do not speak any of the languages in the region, but am going to get certified to teach English before I leave if that is helpful.
Please let me know if you have any suggestions or advise. I already have two places set up in Cambodia where I will be spending a minimum of one month at each. I have lived and worked on an organic farm my whole life, I did my final thesis paper on the importance of Community gardens, I worked as a service learning student leader at my college for other peers, currently run a local youth group, worked at a homeless shelter for a year and have a genuine interest in getting to know local communities, since I have no experience in South East Asia.
Thanks!!