What does Olivia keep trying to get from Viola/Cesario?

In short, Olivia is trying to win Cesario's love. Olivia has fallen in love with Cesario, who is really Viola in disguise. While she is not at all subtle in her love, her actions are all with the direct intention of getting Cesario to return to the house. First, she sends Malvolio after Cesario with a ring and the message that Viola left it behind. Olivia knows that Cesario will have to return in order to return the ring. When Cesario does come back, Olivia admits that she sent Malviolio with the ring and knew that Cesario had not left it. She reveals her feelings for Cesario during this exchange, and when she is rejected, she begs him to return again. Her desperation leads her to reason that if Cesario returns, maybe she will be persuaded to love Orsino. Olivia knows that if she indicates that there is a chance she could love Orsino, Cesario will have to return because it is his job to woo her for Orsino.