The spelling "deutsch" is the word German in German. The noun form is Deutsche (German man, plural Deutschen).
The German word for how is wie.
und is and in German
The German word for Why is Varrum
Ich
sind
Wo.
mien
zu
The German word for "book" is "Buch"
At can be translated as an, bei or auf in German.
The German word for mother is Mutter.