The phrase "expanding his knowledge" is correct and usable in written English.
You might use it when referring to someone's education or learning opportunities, such as in the sentence, "By taking classes and reading books, he was constantly expanding his knowledge."
Every moment not spent refining his technique or in some way expanding his knowledge of human nature and how to exploit it is, to his mind, time wasted.
Sun traveled to Senegal with the goal of expanding his knowledge of global health issues and succeeded; a similar resolve to broaden his horizons steered him toward the College two years earlier.
Garcia credited Saunders with teaching him the Great American Songbook and expanding his knowledge of harmony.
As well as expanding his knowledge of law enforcement, Lowe also stays in contact with officers and others he met during the academy.
Since starting at Cornell, Hopwood has taken full advantage of opportunities to expand his knowledge of viticulture and enology.
He has apprenticed in kitchens ranging from Tabla and Vong to Lespinasse and Cello, but Le Bernardin is his favorite, and he continues to expand his knowledge there.
To expand his knowledge of biochemistry, and protein chemistry in particular, he took additional classes and pursued a fellowship at the Carlsberg Laboratories in Copenhagen.
"He was always looking forward, working to expand his knowledge and understanding,"Sheila E, a musician and longtime Prince collaborator said to Smithsonian Magazine.
He will also be forced to expand his knowledge of cybersecurity, which Mr. Mueller made one of the bureau's chief priorities after counterterrorism.
He accepted the assignment reluctantly, but like Hall and Holt, soon realized he had a chance to expand his knowledge, broaden his network, and prove he could execute and innovate.
Hear how his defining moment at Cornell has expanded his knowledge base and enhanced his skills as he navigates his academic and career paths.
