'probed into' is a correct and usable phrase in written English.
You can use it to mean an investigation or inquiry into a particular topic. For example, "He probed into the company's financial records to uncover evidence of fraud."
Dan's earnest eyes probed into hers.
Scholem was compelled to endure intermittent chaos even as he probed into Kabbalistic theories of exile and redemption.
Josiah continued to stare at his screen, while Denise's eyes probed into Mae.
Finally, journalists called "muckrakers" probed into all the dark corners of American life and carried their message of reform through mass-circulation newspapers and magazines.
Having initially probed into the make-up of shaving foam in his bathroom, he decided to approach a local cosmetics factory, who, welcoming the challenge, would help him create a formula that would make the foam visible for more than two minutes and also not damage skin.
She pored through old files and transcripts, searched out aging Klansmen and probed into the intimate connections between the lions of industry -- the Big Mules of Birmingham, Ala., whom she used to see every day at the exclusive Mountain Brook Club -- and the underworld of racist thugs who gave Birmingham the appellation of Bombingham.
We'll probe into this further.
Probing into the gloriously, infinitely complex nature of human consciousness is what it's really about.
Regime forces have entered the neighbourhood and are probing into adjoining districts.
So is there any way for art to probe into the heart of darkness?
The social scientists, too, have been busy probing into the causes of violence.
