Magnitude not working with getchildren?

Ok so I have parts spread across a baseplate named "Hello" and so each part that is named "Hello" is inside a model and the model is inside a folder in workspace called "Wow." So whenever a player walks up to one of these parts, a simple text gui would become visible. Now this question was answered by someone named asdfghjk9019 however I forgot to mention that the parts where in different models. I tried making the script seeing whether the part was inside a model named "MAIN" which the model name of "Hello," however that was unsuccessful. I hope you guys kind of understand what I mean, sorry if it doesn't make sense. .~.

local c
script.Parent.TextLabel.Visible = false
while true do
    for i,v in pairs(game.Workspace.Wow:GetChildren()) do
        wait()
        if v.Name == "Hello" and v.Parent.Name == "MAIN" then
            local dis = (v.Position - game.Players.LocalPlayer.Character:WaitForChild("HumanoidRootPart").Position).magnitude
            if dis <= 10 then
                script.Parent.TextLabel.Visible = true
                wait()
                c = i
            else
                if i == c then
                    script.Parent.TextLabel.Visible = false
                    wait()
                    local c = nil
                end
            end
        end
    end