I have mold in bathroom used different products but mold always comes

white vinegar or tea tree oil should kill mold

vinegar straight out of the bottle, pickling vinegar is a stronger version.

Absolutely! Plain old white vinegar! Vinegar kills mold spores, bleach does not. You do not even have to take my word for it, just Google, vinegar v. Bleach.

You have too much humidity. Install a ceiling exhaust fan with sufficient power for your size bath, and get one with a humidity sensor. In event person fails to turn it on, it will switch on, by itself. Dry the shower, wall areas and ceiling after showering. Run exhaust fan at least 20 min. after showers are done.

Cleaning vinegar should work. Grocery stores usually carry it. Also, make sure your bathroom is ventilated. If you have a vent already it could be that you need to leave it on longer or it isn't the correct size for your bathroom. Also if the paint is molding after removing the mold, prime with stain blocking primer (not water based). Then, paint with a good quality bathroom paint with a mold inhibitor in it.

Sounds like you need some ventalation in your bathroom to prevent the mold in the first place. If possible have a ceiling vent fan installed. You can buy them with a light and they come on when you turn the light on. They make a huge difference. Best wishes!

All of the answers are great ones, but I'm wondering if there's mold IN the walls which is why it keeps reappearing. Do NOT paint over mold. Make sure the problem is 100% corrected before applying any primer or paint. Do it right and be safe. Best of luck.