O goshi- major hip throw. You hold the uke with the arm hugging the small of his back, and lift with the legs. Tsuri goshi- lifting hip throw. like ogoshi, but more upper body strength is used by grabbing the belt, not just encircling with the arm.
With Ko Tsuri Goshi , you reach under the arm, just like ogoshi. O tsuri goshi you reach over the arm (or sometimes the shoulder) to grab the belt. More of a sambo-type throw, but it can really work well.