My DH and I have been diagnosed w/ unexplained infertility, but we have done two IUI w/out sucess. Good Luck, but I would suggest that you two get tested first.
Have they done any tests to try to pinpoint what is causing your infertility? I'm not familiar with clinics ion Kuwait, but if you've been trying IUIs for a while with no success, in two different countries, I'm not sure changing clinic will help. I would say, the first thing to do, if you haven't already, is checking if her fallopian tubes are open. Otherwise, IUIs will not help, as the sperm and egg won't meet. Also, has she been on any medication to produce multiple follicles for any of the IUIs? If not, that might be another option to increase your chances. Of course, there's always IVF, where the sperm and egg are fertilized outside the body. IVF is a lot more involved and expensive than an IUI, but after trying some of the things above, it might be the next logical step. Best of luck!