[O] navigate between source code blocks

[Zhihao Ding]

Dear Org experts, 

I’ve got a simple question: how to speed up jumping 
between code blocks? 

My org file grows larger every day with more and more
source code blocks. I find myself spending increasing 
amount of time finding the right code blocks to go to. 

Could anyone suggest a method to increase efficiency?
So far I’ve tried (1)  simple search and (2) C-c C-v g, 
which for some reason often fails to find blocks. 

Thanks very much!

Zhihao