Is there an easy way to seam vinyl flooring???

I am on my third try of fixing my entry way we have already put down the self stick tiles but moisture sepped under them and lifted them up 2 times now and I am going to put vinyl down only problem is that the piece was a freebie and it is about 4 inches short on one side although I have plent of vinyl that I could piece on that end Im not sure how to go about it as I have never laid this type of flooring before.

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Lay the two pieces of vinyl down with a 2 inch overlap with any pattern it might have matched up. Cut the vinyl in the middle of the lap while not allowing either piece to move. This will give you a perfect match since both are cut at the same time. They make a seam sealer that if applied will keep the edge from rolling up in time. Good luck
You would think after two failed attempts at trying to do this cheaply you would spend what it takes on the floor to get it right the third time. You can't do what you are asking without it looking like total $^&%. Forget the stick on tiles. They are no good. Forget the free vinyl piece that is too short. Start over and do it right. Or just throw a big rug down and be done with it. That is my $0.02
yes they make a seam kit, although you will have to find the right kit for your specific vinyl. its called a seam sealer it two or three parts, youll find it at menards hd or lowes
As others have said yes they make a seam sealer kit by all manufactures of vinyl in both a low gloss and a high gloss. You can buy them just about anywhere floors are sold most run around $20 bucks. As you have come to understand in the last 2 attempts the seam in any vinyl floor is its weakest point whether in self stick tiles or in sheet vinyl. Yes I know that it was free and you are trying to make this work, but you shouldn't need more than a 12 x 5 piece of vinyl use a builder grade @ 6.99 a yard that is only $47 bucks. Please if you are willing to spend the $20 on a seam sealer kit spend the extra $27 on a piece of vinyl that will work with no seams. In the 15 or so years I have worked in the flooring industry I cant count how many times I've gone to fix someones DIY seam in either carpet or vinyl. Best wishes.