I would suggest creating an array of the possible conditions you want.
A = {'param'; 'm_param'; 'g_param'};
Then you can just create a loop that breaks if you don't find what you're looking for.
for i = 1:size(A,1)
B = find_system(Name,A{i});
if ~isempty(B)
break
end
end
This is a basic example setup, and probably won't be exactly what you need, but it should get you started.