"combining at least" is correct and usable in written English.
You would use this phrase when referring to two or more components being combined into a single entity. For example, "We are combining at least two sources of information to create a comprehensive report."
In the now familiar logic of Harold Bloom's "Anxiety of Influence," originality in literature is usually a matter of combining at least two unlikely influences.
Every powerful woman I know looks tired most of the time, exhaustion being the natural concomitant of ambivalence, of combining at least two lives into one.
Pearson and Dow Jones have reportedly explored from time to time how they might cut costs by combining at least some of their operations, a question they would probably return to if a deal is done.
During a rare underwhelming gig on the Smiths' Meat Is Murder tour, the singer departed the stage after being hit in the face by a string of sausages, in perhaps the solitary example in history of someone combining at least a degree of satirical intent with the more earthy activity of lobbing things at people.
According to the prevailing practical approach, the full price for a counterparty risky contract is typically obtained by combining, at least implicitly, the so-called clean price of the basic contract (A,0) with various valuation adjustments.
A conjoined gene is defined as one formed at the time of transcription by combining at least part of one exon from each of two or more distinct genes that lie on the same chromosome, in the same or opposite orientation, which translate independently into different proteins.
Many of the pieces combine text, photo, and video, and all combine at least two.
She combines at least five different prints for each coat, and the coats are reversible.
INSIDE PITCH David Wright became the 29th player in major league history to combine at least 30 home runs with at least 30 stolen bases.
As a result, today's services typically combine at least two technologies, most often third-generation (3G) mobile-phone networks and satellite links.
Thus, the tile work of a Persian mosque, which combines different levels of arabesque work with different styles of writing, is reminiscent of the way Persian poetry combines at least two levels of reality.
