Complete... please?

I am looking for a complete box, all expansions, etc... including Jyhad... where could I find something like that?

I have never seen anything like that in my almost 20-year vtes experience. I think closest you can get to that is buying a huge collection from someone or buy single sets from people. Some sets will be rather easy to find and low in cost; others might be harder.
jyhad, black hand, ebony kingdom will be relative easy; sabbat, final nights, keepers of tradition, httb, ... will be harder and much more expensive. Basically the sets that are still available in booster packs/boxes will be the easiest.
Good luck in collecting this.
Ps If you would go for purchasing single sets, i have one complete set of jyhad, ancient hearts, ds en sabbat available.