I have found some 4 leafs clovers in my garden.
Please, is there any way to reproduce them?
First you need to identify the plant you have found. Lots of plants go by the common name 'clover' and some naturally have 4 leaflets. On true clovers (Trifolium species) four leaves are genetic sports and can't be reproduced. If you could post a photo we could id the plant and tell you if four leaves are normal for it or not.