Thanks all for your recommendations!
The definition of a chypre is a base of oakmoss, patchouli, vetiver, cistus labdanum and top notes of bergamot. This is the base of the chypre. Then you have several sub-categories:
floral chypres where flowers notes are added (examples in the traditional perfumery: Aromatics Elixir by Clinique, Eau du Soir by Sisley, Paloma Picasso, ...);
fruity chypres with fruity top notes (ex.: Mitsouko by Guerlain, Yvresse by Yves Saint Laurent, Deci Delà by Nina Ricci, ...);
green chypres with lots of galbanum (ex.: Aliage by Estée Lauder, N°19 by Chanel, Silences by Jacomo, Scherrer by Jean-Louis Scherrer, ...);
oriental chypres with amber, woods notes in the base (ex.: Magie Noire by Lancôme, Mystère by Rochas, Red by Giorgio Beverly Hills, ...)
I love every chypre sub-category. For the moment, I'm searching for super sensual oriental chypres, the kind of big scent with a huge sillage that you remember for long