Why didn't Bill Clinton ever give credit to George H.W. Bush for the capture of Slobodan Milosevic?

Thalia is correct. If you dig further, you will discover that all during the genocide caused by Slobodan Milosevic, Brent Scowcroft and Laurence Eagleburger, both officials in the Bush/Quayle administration, were both in business with Milosevic during the period of genocide and this is one reason why the killing was allowed to continue. The Hugo car company was just one of these business ventures...