I’m so confused about the order of these stories

1. Doulou Dalu
2. Combat Continent II
3. Doulou Dalu 3
4. Soul Land IV
That's the order it should be read, cus I think they can help explain events that happen in this story.

Thanks chief

It'd be
1) Douluo Dalu
2) Douluo Dalu 2 - combat_continent
3) Soul Land - Legend of The Gods' Realm (Side Story)
4) Douluo Dalu 3 - The Legend of the Dragon King
5) Soul Land - the ultimate combat (Douluo Dalu 4)
6) Douluo Dalu 5 (or Soul Land 5)