Would you please help me find some articles about "the importance of play in child's life"
In order to get the best results, use keywords or tags to identify the most important concepts of your topic. For example, based on your question, I would use children and play and importance (just like that) to search for articles.
If you need to have scholarly/peer reviewed articles for your class, make sure you check the box to tell the database to show you only those kinds of articles. See the video ProQuest Searching on how to do this.