buenos = good (masculine plural)
tienes = you have
"Primos tienes" means "Do you have cousins?" in Spanish.
¿Tienes un buen día?
have have
si can be "if" or "yes" tienes comes from tener which mean "to have" there it can be either "if you have" or "yes you have/you do have"
Tiene / tienen / tienes / tenéis
"do you have the window?"
"¿Cuántos años tienes tú, amiga?" is Spanish for "How old are you, (female) friend?"
tienes un amigo = you have a friend ¿Tienes tú amigo?= Do you have a friend?
buenos dias = good morning in spanish
You have (singular, familiar address)
Did you have a good day in Spanish.
First of all it's grammatically incorrect. Tienes unos dias buenos Secondly, it means "Do you have some good days?" Unless you mean: 'Tienes un buen dia?' = Are you having a good day?