I had a Sewer Smell in my Bathroom which I think it comes from the Bathtub, I had my Septic Tank Pumped, it was Full, it liked Gushed out when he removed the Lid. But the same day after being pumped, when I flush the toilet it still gurgles in the bathtub, and then the smell, but it doesn't do it every time. They snaked my vent on top of the house, and also ran a Garden Hose in it. Didn't seem to be blocked. Then after a few weeks someone suggested to open the cleanout, between the House and the Septic Tank, that there may be a Blockeage there, the cleanout is in my Basement, but before doing that someone said to Dig the Septic Tank up again open the lid to make sure it isn't full again, and that was done and the Tank was not full. So that cleanout was snaked. Not Blocked.
I had put a new Tile Floor in My Bathroom, and a New Tall Boy Toilet, about 6 month's ago. My daughter says that is when it all Started.? I do know that when I Flush this toielt it is really Fast Flush, just like Whoosh!! And then the Bathtub start's gurgling... Then the Smell. But it isn't every time. I am at my Whit's End!! Please Help!
It hadn't been to bad the last Couple of day's... But Today it is Horrible... I have to leave the bathroom window open, Close the door and Put Towel's up against the door.. Any Help will be Truly Appreciated!!

The gurgle tells me the toilet's attempting to vent through the tub trap. The suction produced by this action is pulling water out of the trap allowing sewer gas to enter your home. The solution would be to snake the lavatory roof vent. If you only have a single vent coming out of your roof then the plumber snaked the wrong vent. The correct lavatory vent will be found up in your attic revented back into the main roof vent. He will have to disconnet the lavatory vent and snake it from then attic.
Good luck, Tom