How to spawn cows in minecraft if there's no cows to be found?

You need grass blocks at least a 10x10 area of grass blocks. If you are already in a grass block area. I'm afraid you have to wait, or go into creative mode and take cow spawneggs for yourself. Here is the command for creative mode from survival mode. /gamemode 0

You can only spawn cows yourself on survival mode. Otherwise you need a large area of grassy blocks and some luck.

You can go explore way out into the wilderness (Plains work best for seeing animals) Other than that you can into creative and spawn a few cows in using creative if you don't mind your achievements/trophys being disabled.

You can only do this on Creative mode. Are you on Creative mode or Survival mode? To do this, you must not be on Survival mode, you have to be on Creative mode. Re-create your world to Creative mode and then open the Creative world. When you spawn, hit "e" on your keyboard to open the inventory. After that, find the egg spawners in your inventory, which is how you spawn mods. Lastly, click on the "Spawn Cow" egg and press "e" again to close your inventory, right click anywhere in the terrain and you've spawned a cow.