"Venden" by itself is the "ellos/ellas/Uds." conjugation of "vender" which means "to sell". If it is a statement, it could be translated as "They sell" or "You all sell". If it is a question, is could be translated as "Do they sell" or "Do you all sell?"
se venden automoviles
The Spanish verb meaning "to sell" is "vender". The third person plural is "venden". Example: Ellos venden su coche. "They sell their car". Many times this would be translated as "They are selling their car". This is not totally accurate, but it is done to make it sound better in English.
dog
afuras is not a spanish word.
It is the Spanish word for "fox".
"quidera" is not a Spanish word.
"Coll" is not a Spanish word.
gaka is not a Spanish word
The word for "after" in Spanish is "después".
I think what you mean is "What is the Spanish word for let?" because the word "let" is an English word, not Spanish. The Spanish word for "to let" is permitir. "Let me" is "permítame."
quest is not a Spanish word.
Nuxe is not a Spanish word.