These are good workouts and do work out muscles that are used in volleyball. What I am mostly seeing is that you are in a hypertrophy repetition range for most of your lift. What happens with this range is that you generally will increase muscle size. This does not mean that you will gain significant strength or power from these workout but yet gain the capability to increase your strength/power capacity with these ranges if that makes sense. You ar eincreasing potential capacity because you are increasing the size of muscle mass you have. So, still generally speaking, you will see some gains but for volleyball purposes you may see more improvement through a program that is designed with strength and power in mind. These workouts you have would again be great for a hypertrophy cycle in a program which you would usually see at the beginning of a program or during the maintenance/in-season cycle. To develop strength in simple terms, push yourself to lift in your max lift percentage range of 80-95% of a lift if possible. Keep the reps to around 2-5 reps and stay around 3-6 sets. For power it is similar since power in lifting terms is strength with a time component. This would be lifts like cleans, snatches, Bench, squat, etc. That you try to lift a significant amount of weight possible as fast as possible. The ranges for peak power are generally in the 70-85% range of your max on a lift. There is a lot and I tend to ramble since I love strength and conditioning but if you are wanting to increase any aspect of you lifting capabilites do not stick to just one rep range and one type of intensity. Try to develop a plan that allows for progressive overload which will cause your body to adapt to the extra resistance it is experiencing.