I you want to hunt one at a time:
Dry piece of wood - kill Bane bringer
underground of Green Claw Swamp
Goblin Ear - kill Goblins
on west of Edron
Lump of Dirt - kill Rotworms 
in Vandura caves
Spider Fangs - kill 
spider and 
tarantulas in spider caves near Port Hope
Bat Wing - kill 
Bat or 
Mutated Bat in Yalahar or Vengoth
Centipede Leg - kill 
centipedes on Tiquanda or Trapwood Dworcs Lair
Marsh Stalker Beak - kill 
Marsh Stalker in Dryad gardens in cormaya
Scorpion Tail - kill 
scorpions in Darashia montains (if you are low level) or Plains of Havoc
Lancet - kill 
blood priest and 
blood hand in Drefia
Minotaur Horn - kill all types of 
Minotaurs in Minotaur Pyramid in darashia or Mintwallin under Thais
Small Flask of Eyedrops - kill 
Bonelords, 
Elder Bonelords or 
Gazer in Bonelords' Cave in Fenrock or Vandura
Sulphurous Stone - kill 
Stone Golen in Stone Golem Cave on Formorgar Glacier or Hrodmir
Tarantula Egg - kill Tarantulas in spider caves near Port Hope
if you want to farm several items together:
In marshland next to Venore you can find Marsh Stalker, Scorpion, Rotworms, Bat
In Plains of Havoc and Dark Cathedral you can find Minotaurs, Bat, Centipede, Scorpion, Bonelord, Stone Golen, Tarantulas, Spiders, Rotworms
Sources: tibiawiki.com.br and tibia.fandom.com
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