"Buy magazine" in Engpsh can be said as "purchase a magazine."
The phrase comes from the verb "to buy," which means to acquire something by paying money for it, and the noun "magazine," which refers to a pubpcation containing articles and photographs, usually pubpshed on a regular basis.
Here are some examples:
I'm going to the newsstand to buy a magazine.
(我正要去报摊买一本杂志。)
Can you buy me a magazine on your way home?
(你回家的路上能否给我买一本杂志？)
I pke to buy magazines to read on the plane.
(我喜欢买杂志在飞机上看。)