The phrase "a special knowledge of" is correct and usable in written English.
It can be used when referring to a specific area of expertise or understanding that someone possesses.
Example: "To excel in this role, you must have a special knowledge of data analysis techniques."
Alternatives: "a deep understanding of" or "expertise in".
We hoped to approach that complete account by harnessing the expertise of people with a special knowledge of, or information about, the emails.
He is a newspaperman, at present working on a Sunday tabloid, who has a special knowledge of British Fascism and has written a handbook on it.
Bermuda was being devastated by a yellow fever epidemic, and Dr. Blackburn said he practiced medicine in New Orleans and had a special knowledge of the disease.
Although he sees only children and thus acquires a special knowledge of childhood maladies, he remains a generalist who looks at the whole patient.
Priesthood, the office of a priest, a ritual expert learned in a special knowledge of the technique of worship and accepted as a religious and spiritual leader.
Her confidence that she has a special knowledge of these intentions is signalled in the opening section of each of her chapters, where she provides novelistic episodes in which "Jane" (always called so in this book) ponders the lowly status of women or the effects of rural poverty or the evils of slavery.
As entrepreneur A does not have any special knowledge of these markets, he seeks business partners who have knowledge of and experience in this field to gain a competitive advantage.
And though the clip works without any special knowledge of "Public Enemy," there is a subtext that adds resonance for viewers familiar with the film.
The letter writer did not display any special knowledge of the case, he said.
I tell you this not to claim any special knowledge of how you've grown, but to explain how I have, and from where I draw my understanding.
Therefore there are no high requirements on any special knowledge of the first-aid providers.
