Ok I'll be as clear as possible on this.
Short answer:
Go to the NPC, buy grade 8 equipment, decompose it.
Detailled answer:
Find any tailor, blacksmith or craftsman. Click the option to buy stuff, buy equipment of grade 8. Grade 8 items should decompose into Liuho stones. You can tell if something is grade 8 by hovering your mouse over it's icon and finding the line that says "Grade: <number>" Once you have it talk to the npc again and select the "Decompose Item" option. Drag the item you just bought into the window and decompose it for the stones.
What I want to say:
Use your damn brain and try it. How is it harder to go to an npc and TRY to get it right than posting on the forums and waiting for ages? It's not that hard to figure out ffs...