Be aware that you might a lot of very different (and relatively unrelated) things if you just search for "Formosa oolong". Based on your description, you might

Be aware that you might a lot of very different (and relatively unrelated) things if you just search for "Formosa oolong". Based on your description, you might have better luck with "Taiwanese oolongs", "dingdong oolong", "high mountain oolong and "Alishan oolong".