{"searchPhrases" : [
            "cheap samsung mobile",
            "red nokia 2mp"
        ]
    }

  { "searchPhrases" : [
        "red peter england shirt",
        "redish lee pant"
    ]
}

db.readData.aggregate(
 { $match: {"searchPhrases": { $in : ["cheap samsung mobile"] } } },
 { $unwind: $searchPhrases },
 { $match: {"searchPhrases": { $in : ["cheap samsung mobile"] } } },
 { $group: { _id:"$searchPhrases" } }
)