Ok there are several differant types of thai orange trees, none of them are very good, I have 3 or 4 differant types at the moment, so if I went to Malaysia and bought some of the really nice oranges they have there and brought back the seeds,
1. Would they grow?
2. Would they get fruit?
Anyway here's a picture I took this morning of my first orange, the tree is about 1.5 met high and only has one orange on it.
https://teakdoor.com/images/imported/2005/08/206.jpg