Ahh there we go again .
Do it properly the first time and you wont have to touch it again .
First where is your house situated , in a hollow , on the side of a slope dug in a way . Do you have trees around the place . Do you get water run off from prpoerties higher then your place , how old is the concrete, was Polythene used under the concrete slab when it was poured and a million other qusetions .
The Vinyl that is stuck to the concrete will not be sufficient for a moisture barrier , it will not hold back hydostatic pressure that comes through the concrete. . There is only one way to seal concrete and it is to use a proper 2 pot hydorstaic paint and apply 2 coats and fill any cracks as you are doing it .
Then a sheet of polythene with the joints overlapped 200mm and taped  twice .
The polythene then also need to come up the walls away untill the floor is installed and then trimmed and the edge tucked down and hidden .
Moisture is a major problem in any country .we have the same types of problems and the cure is the same where where ever you are .

Concrete is pourous and through capilary action the water tracks it way to the top surface even if the slab has a water proof sheet under it the water will still get in from some where .

Bye