Perhaps you should try some spelling variations:
"nhung noi quan quang. toi quyet dam bao" » "nhung noi qua quang. toi quyet dam bao", "nhung noi quan quan. toi quyet dam bao", "nhung noi quat quang. toi quyet dam bao", "nhung loi quan quang. toi quyet dam bao", "nhung nguoi quan quang. toi quyet dam bao", "nhung nghi quan quang. toi quyet dam bao", "nhung noi quan quang. toan quyet dam bao", "nhung noi quan quang. bi quyet dam bao", "nhung noi quan quang. thi tuyet dam bao", "nhung noi quan quang. toi quyet lam bao", "nhung noi quan quang. toi quyet tam bao", "nhung noi quan quang. toi quyet diem bao", "nhung noi quang quang. toi quyet dam bao", "nhung moi quan quang. toi quyet dam bao"
"nhung bi luan van. thoi xuan thuy lap" » "nhung bi luan van. thi xuan thuy lap", "nhung bi luan van. tho xuan thuy lap", "nhung bi luan van. thoi xua thuy lap", "nhung bi luan van. thoi xuan huy lap", "nhung bi luan van. thoi xuan thu lap", "nhung bi luan van. thoi tuan thu lap", "nhung bai luan van. thoi xuan thuy lap", "nhung gi luan van. thoi xuan thuy lap", "nhung bi luan van. thoi xuan thuy lai", "nhung bi luan van. thoi xuan thuat lap", "nhung bi luan van. thoi xuan thuy phap", "nhung li luan van. thoi xuan thuy lap", "nhung bo luan van. thoi xuan thuy lap"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung bi luan van. thoi xuan thuy lap") or ("nhung noi quan quang. toi quyet dam bao"))~.
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• Adding a wildcard symbol may retrieve word variants: (("nhung bi luan van. thoi xuan thuy lap") or ("nhung noi quan quang. toi quyet dam bao"))*.