I''m currently a student here in Bangkok studying abroad, and I only have a month left to find my Mom's family here. I have a letter from an address here with an unrecognized name (maybe my aunt changed her name or that person married into the family) but it was sent in 2004, and I also have my grandfathers name who passed. I don't know how to go about this in trying to find them. I might try going to the district office of the address on the letter, but will that help me at all?? 

" I might try going to the district office of the address on the letter"

That would be a good start, do it asap, a month isn't very long.

Contact Mark Prado, this is his speciality:

http://www.thailand-adoption-tracing.com/about-us.html