To figure out what people search for I start typing in the Etsy search bar "Feather hair" and then below you'll see what pops up... from doing that, some things to add might be "feather hair piece" "feather hair clips" and "hair feather" as tags. I believe "hair feather" together as one tag is stronger, in terms of search results, rather than two separate words, if that is a phrase commonly used. Someone please correct me if I'm wrong.