As you heard, there is no complete cure for genital warts caused by HPV infections. Anyway, there are some methods of treatments available. You can consult your doctor for the best method which will work fine on you. Cryotherapy, which includes liquid nitrogen treatment to kill warts is one of the popular methods to remove warts. Radiation treatment, application of skin creams also will work in removing genital warts. But it is better get consulted with some uroglogist or gynec, before starting treatment. In your case, it is a little bit complicated, as your warts are inside vagina.  Try applying creams like Podophilox, on your own and as per the directed dosage in the label of the medicine. Take care.