UNICODE characters in FPDF

I have a define label like this,

define('LABEL_033', 'සිංහ සමාජ පරිපාලන වාර්ථා පෝරමය');

Once I put the LABEL_033 in the page (php page with all the HTMLs) I can properly see the text. However when I add that in FPDF, in a cell as a string I cannot see that properly, but some annoying characters.

I tried that too. But it didn't work with Sinhala fonts, basically I couldn't create all formats out of the true type I have.