Search In TreeView when SearchValue has space in between

Question

Dear all,

   I am creating an application with VB.Net.In my application i am using a treeview and nodes are loading from database.All nodes are parent and no child.My problem is how we can search node if node value has space in between?My node values are like DF 4562,OP 2514,DF 1125,DF 6895 etc.In normal case we can search values easily by clicking value in keyboard if is don't have space.Please help me