What do you suggest if my husband always like the idea to have twins children. is there really a way to get yourself a twins, or is it just pure luck?

Not natural ways: There are medications that can cause multiple eggs to ovulate. There is also in-vitro fertilization where you place two embryos in. But there are no natural ways to promote twinning - what you hear and read are a bunch of wives tales - otherwise it is indeed just something that happens. Not always a good thing , though. Much higher risk of premature birth and all the accompanying problems.