What's the way to say "too/also/as well" in Taiwanese?
There are three words corresponding to Mandarin "也" in Taiwanese Hokkien. 


也 iā
亦 i̍k
嘛 mā


I believe that in colloquial Hokkien, 也 is used exclusively in co-ordinated constructions, of the form "也 X 也 Y", which isn't what you want here. It is 嘛 that you're looking for.