Usage Note
Erfolg is masculine (der Erfolg) and you 'have' it with haben, as in Erfolg haben. The greeting Viel Erfolg! means 'Good luck / best of luck' for an exam or venture. Its adjective erfolgreich means 'successful'.
Examples
"Der Plan hatte großen Erfolg."
Natural Translation
The plan was a big success.
Literal Translation
The plan had big success.

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