Is there a school that offers Business Administration, Human Resource management and Project management all together at post graduate level?

Am a graduate of Geology and I have been self employed ever since I graduated. I have my own hydrogeolological company where I drill boreholes and conduct water treatment for clients. My company is expanding with more clients, more contracts and I have over 20 staffs working in my company.
At this point, I think I need more knowledge in administration and management to be able to run the affairs of my company more efficiently. I wish to go for a post graduate course that encompasses business administration, human resources management and project management. Will like to know if there is any school that offer these 3 packages as one in Nigeria. Don't mind going outside the country to get this knowledge but I think Nigeria is better so as to run my business along simultaneously.
Thanks as u contribute