If you start an English league, then players playing in England (whether foreign or home) and players with English nationality playing overseas will appear, of course there will be fewer players from other national leagues (the lack of which will be mainly low potential and under-recognized players).

The fact that you can only find players from your own country and foreigners playing in the Chinese Super League means that your scouting knowledge is insufficient and the clubs are not attractive enough for you, so the computer automatically filters out the other players. The solution is simple, sign better scouts or send scouts to other countries to expand their horizons. Tweak the filters a bit in the settings and the other players will show up.

Other meanings:

fm means frequency modulation, and FM is generally used to refer to FM broadcasting, and in fact FM is a form of modulation. In addition to this meaning, the internet term fm is also an abbreviation for Fan Meeting, which means fan meeting, and this usage is now common.

FM is actually FM, generally refers to FM radio, in fact, FM is also a modulation, even in the short-wave range between 27-30MHz, as amateur radio, space, satellite communications applications of the band, there is also the use of frequency modulation (FM).