I have white milky discharge from more than 6 months and i taken metronidazole and diflucan (fluconazole) but without any progress. culture test show few bacteria.

It could be: Your normal if no yeast is found and not a lot of abnormal overgrowth . If it does not itch or bother you then don't worry about it. All women have some discharge and it is usually a whitish to yellow depending on the time of the month. Green is never normal and itchy is not normal. You have been treated for both. Bacterial overgrowth and yeast. Best!