[{_id:1,"title":"test","desc":"test desc","items":[{"items":"abc","tags":["a","b","c"]},{"items":"xyz","tags":["a","b","d"]},{"items":"xyz","tags":["a","b","d"]}]},{_id:2,"title":"test","desc":"test desc","items":[{"items":"abc","tags":["a","b","c"]},{"items":"xyz","tags":["a","b","d"]}]}]

db.collection.aggregate([{$unwind:"$items"},{$match:{"items.tags":{$all:["a","b"]}}},{"$group":{"_id":"$_id","myitem":{"$push":"$items"},desc:{"$first":"$desc"},title:{"$first":"$title"}}},{"$project":{"_id":1,desc:1,title:1,"myitem":{$slice:["$myitem",2]}}},{$unwind:"$myitem"}])