He developed players like Nedko Nedev , Ivan Derventski , spas Kirov , Stefan Bogomilov , Bozhil Kolev , Stefan Yanev , Damjan Georgiev . He developed players like Nedko Nedev , Ivan Derventski , Spas Kirov , Stefan Bogomilov , Bozhil Kolev , Stefan Yanev , Damyan Georgiev .