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We assume that $V$ is positive and $f$ has the subcritical growth but not higher than $|u|^{q-2}u$. If $\\mu$ is positive and small enough we find a ground state solution, i.e. a critical point of the energy being minimizer on the Nehari manifold. 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We assume that $V$ is positive and $f$ has the subcritical growth but not higher than $|u|^{q-2}u$. If $\\mu$ is positive and small enough we find a ground state solution, i.e. a critical point of the energy being minimizer on the Nehari manifold. 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