give the name of the managers of fc lokomotiv gorna oryahovitsa and bulgaria national under-21 football team ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_managerclubs dbr_FC_Lokomotiv_Gorna_Oryahovitsa sep_dot var_uri dbp_managerclubs dbr_Bulgaria_national_under-21_football_team brack_close