As you can see on a figure, there are two kind of network. The first one on right hand is a main graph and another one is subgraph. My question is Are there any algorithms or techniques (cypher) that can query only the sub-graph?
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Hello @natakorn.chanpetch 
I think you should have a look at the Weakly Connected Components algorithm
Example: How to remove connected components less than x nodes? - #43 by Cobra
Regards,
Cobra
thank you sir, it works very well for your example. I applied it a bit for solving my problem, but it not work well with a large of network (6xx nodes and 6xx relationships). By the way, I will read the wcc algorithm and understand it as fast a s possible. I hope it can tackle the problem. 
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I used the wcc algorithm's stream function to display each component (componentId) and set filtering by select only record that has the number of elements between 2 and 10 nodes. Moreover, a result was really good. Thank you again for helping me 
@cobra
Nice, no problem, I'm happy to help 
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