How to handle Multiline Header in self service reports

Hi ,

I am working in Self Service Reports in ARAS 11 SP15 , I need to bring column header as muliple lines ,

Example: In the below image , 3rd and 4th column has three words but the actual requirement is to make those words as a separate line 

I tried with Multiline Header in advanced property settings of each property,but not able to achieve as multiple lines.

Is there any other option to fullfill above requirement?

Thanks in Advance.