I have three kids my husband still want twins boys, because my husband is a twins so he always said he want his image as a twins, so what can i do to have twins?

Nothing: Unfortunately there's no way to improve your chances of having twins if you are trying to have children naturally. There are ways to manipulate your chances of having double births through IVF, but this is costly and not something that I would recommend if you've been able to have children without help in the past. Just cross your fingers and hope for the best.