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I wrote this sentence -
Not that I did not try to find him, but no one who I know knows about her.
Is this sentence understandable?
"No one who I know" is it correct?
What I intended to mean -
"I know a few people. Among them there was no one who knows about him"
I would understand you perfectly.
Having said that, I wouldn't normally use a double negative in the first part of the sentence, and I'd omit the "who" from "no one who I know":
I tried to find him, but no one I know knows about him.
I'd change these things as a matter of style, however, not grammar.
The second part of your sentence may be harder to understand because of the two consecutive verbs, one for the relative clause ("who I know") and the main verb ("[no one] knows").
Also, when I try to read your sentence out loud, I tend to pause after "I know" to signal the end of the relative clause.
Here's an alternate wording:
..., but I don't know anyone who knows about her.
This attaches a relative clause to the object (instead of the subject), allowing the clause to be at the end of the sentence, so it doesn't come between the subject and the main verb.
It also puts more emphasis on the "I" instead of the "no one". In some cases it could be clearer to have a positive subject rather than a negative subject.
