Se (itself) is a self-help book designed to help readers reach their full potential and create a life of purpose and fulfillment. It provides practical advice and guidance on how to identify and pursue goals, develop meaningful relationships, and create a life of purpose and joy. Se (it
From Wikipedia
"No sé" is a song by Spanish singer Melody. This was a single from her third album T.Q.M.. She released it in 2003, at the age of 12.