Isan is a culturally-diverse north-eastern region of Thailand where the common language is a combination of Thai and Lao and with "touches" of Cambodian (especially in south Isan near the border with Cambodia).
I personally find the architecture, furniture, food and musical instruments of Isan to be similar to that of Vietnam and the language itself might have been effected from Vietnamese.
A great singer from Isan (from Udon Thani province there) was Yard Napalai ; in Thai: หยาด นภาลัย (1947-2010).
Yard had this collection I found in YouTube:
When I listen to it from the following time spans I recognize three different instruments I would like to know their names in English or Thai.
00:01 03:54 17:30
I understand that the last one is a bow-string (Kamanche-like) instrument named Soaw^u (ซออู้).
How would you name the three instruments from the collection?