Toilet, sink and shower blocked
I am assuming Chinese plumbing works the same as most other.  In such case, the only place in common to the sink, shower, and toilet is somewhere past the last one.

You might check with neighbors to see if they are having any problem.  If they started having trouble when you did, the block is downstream of them too, in which case a longer auger is called for.

The toilet has the largest diameter pipe of all of them, so that should provide the best route into the pipe, unless there is a convenient cleanout port.

If the toilet's trap is tight, it may well be expedient to temporarily remove the toilet:  there are only two bolts holding it to the floor, a wax ring (which should be replaced before re-installation), and the water supply connection.

The pipe beneath the toilet should be at least 3 inch inside diameter, so a more stout auger (1/2 inch or larger diameter) is better than a light duty one (1/4 or 3/8 inch) as the light ones tend to curl up inside the pipe and resist being fed (their place is less than 2 inch pipe).