This sentence is grammatically incorrect, but it means: "What a good bonus/cousin!"
(It should be que buena prima for a female cousin and que bueno primo for a male cousin).
"Bueno tengo que" translates to "Well, I have to" in English.
If you are asking what "que bueno no sabia que usted habla espanol" means, it's: "how nice I didn't know you speak Spanish"
"Que bueno por vos" is a Spanish phrase that can be translated to "that's good for you" or "good for you." It is often used to express happiness or approval for something positive that has happened to someone else.
How well you dance.
"Qué bueno fue conocerte" translates to "It was great to meet you" in English.
have goodnight ma'am
It is good that you are not working.
Very well, madam
Adjective: -que -qual de -bueno -lindo Pronoun -que Interjection -como
How good! In English we might say "How wonderful!" instead.
How great, something new.
It means, "What is there [that's] good?"