I can only find the result of "not have the faintest idea" on Google and some dictionaries. Is there the structure "have the faintest idea"?
"not have the faintest idea" is a common and fixed phrase. eg I don't have the faintest idea about the population of China. If you wanted to, you could say eg I only have the faintest idea about the population of China.
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"not have the faintest idea" is a common and fixed phrase.
eg I don't have the faintest idea about the population of China.
If you wanted to, you could say eg I only have the faintest idea about the population of China. But I rarely hear anyone talk that way. It's better not to try changing such fixed expressions.
Clive