How to Export PDF Corresponding Font style

hi

recently ,I Work with a RDLC Report ,using the tools of Reporting services and the font family is "Arial Unicode MS",
Then I deployed the project to the sever,when I export the report to PDF,

Issue
========
It can not display the Tamil Character
It can not display the Tamil Character ,
It can not display the Tamil Character

while i Print it ,the Tamil Characters can display correctly,Do you have any suggestions or solution?

any one guide me.