Why is string.find() returning nil without any errors everytime? [closed]

I've been trying to fix this part that checks if there is a word then return with true or false with string.find() in a function, here is the part of the script:

        local function find1(word)
            local f2c = frame2:GetChildren()
            for i = 1,#f2c do 
                local c = f2c[i]
                return string.find(c.Text,word)
            end
        end
        local function find2(word)
            local f2c = frame2:GetChildren()
            for i = 1,#f2c do 
                local c = f2c[i]
                return string.find(c.Text,word)
            end
        end

        if find1(tostring(amount)) == nil and find2(stat) == nil then

It always returns nil even tho there is the texts in the "c.Text" part.

If anyone could help me and describe what i did wrong here then i would be thankful!