This is the 12923rd most frequent German word.
zhu
The word "zhu" does not exist in German. It may be a typo or not a German word.
The word 'zu' is used here as a part of the verb infinitive 'zuzuhören', adding a nuanced meaning to 'hören' by specifying 'to listen to'.
Ich kann dir helfen, wenn du bereit bist, zuzuhören.
I can help you if you are ready to listen.
The word 'zu' is part of 'zur', which is a contraction of 'zu der', indicating direction toward a specific feminine noun, here 'Kreuzung' (intersection).
Gehe weiter bis zur nächsten Kreuzung.
Keep going until the next intersection.
The word 'zu' here introduces a prepositional phrase 'zu deinem Geburtstag', specifying a purpose or occasion for the action.