[{id:4,parent:1,year:2021,month:5},{id:5,parent:1,year:2021,month:4},{id:6,parent:1,year:2021,month:3},{id:7,parent:1,year:2021,month:2},{id:8,parent:1,year:2021,month:1},{id:9,parent:1,year:2021,month:0},{id:10,parent:1,year:2020,month:11},{id:11,parent:1,year:2020,month:10},{id:12,parent:1,year:2020,month:9},{id:13,parent:2,year:2021,month:1},{id:14,parent:2,year:2021,month:0},{id:15,parent:2,year:2020,month:11},{id:16,parent:2,year:2020,month:10},{id:17,parent:2,year:2020,month:9},]

db.collection.find({parent:1,$or:[{year:2021,month:1},{year:2021,month:0},{year:2020,month:11},{year:2020,month:10}]})