What do you think about Vietnamese girls? (Hanoi)

I have some foreign male friends and many of them said they had bad experience with Vietnamese girls. Some girls get married just to have a foreign husband, many get in love affair to have a few millions dong per month, to hang out free of charge, live a comfortable life without having to work. I feel bad when i heard those stories. Because there are many good Vietnamese girls who need money but do not love money or willing to do everything to get some money from you foreigners. Can you tell me your stories about your Vietnamese girlfriends or partners to support my opinion? I believe there are many happy couples of Vietnamese girls and their foreign partners out there.