Rescue my children and getting back to me

Fleeing & leaving the children behind to live for the children.i don't even need money if someone can give me back my children. I've fled from my country Bangladesh to Vietnam for mental torture and killing mission of my ex wife.my ex wife have embezzled all my money that I've earned as a caby in dubai since 2008 to 2014 and tortured my elder son both physically and mentally for 6 years who is traumatized. When i get to know all about these from my elder son it was too late.she has already all the money in her account by that time .I've been thrown out from home with my elder son to the street as penny less .i struggled 20 days to survive but after playing a trick i was able to give her back my elder son again.I've got the money again by selling the property that my father left.then i started again to continue with her because i didn't want that my children get more shocked as a broken family kids.it didn't work and i tried several times but she continued bringing man to home and threatening me if i don't allow and helpless children was just suffering from this scenario every single day.meanwhile i completed my divorce with her in a very tricky way which I've been suggested by a lawyer that she couldn't know.she didn't even allow my elder son to go to final exam by keeping his school books and uniform that she denied to give while i was on the street for 20 days the time she thrown me from home.as explanations from my elder son when i came back from dubai 2014 i got to know that she used to bring different man in home and used to put my elder son in a dark room.when my elder son became afraid he used to scroll to her room and then she used to punch on his breast and beating him brutally. All the guys my elder son has shown me i could identified them all with proof.she started to torture my children in front of my eyes and i became angry and she planed a killing mission and i escaped and fled to vietnam and spent rest of my money to have my temporary residence card.now i have been disconnected from my kids and i don't know how and where they are.loosing money that i earned with a very hard work I don't want .loosing the prestige in the society i don't want to go back but i don't want to loose and can not live without my children .i can not move to my country because she ( ex wife) has made allegation against me to the police station.so far i know she has given my children to an orphanage. I really don't know where they are.i need to appoint an attorney to find and rescue my kid and bring them here in vietnam ti me at least i can breath and have a overnight sleep that I've not slept last three years.please let me live and just give me chance to see my children before i die.is there anybody who can do any type of help I'm ready to be your slave even if you just rescue my kids from continue torture if they're with her and bring back to me.i want to have my world with my kids.please help any way you can .I'm a 45 years old father from Bangladesh. I beg you sir and medam from all over the world.please