How to show different language on PDF file using tcpdf?

Question

I am generating a pdf file from the MySQL database table data. In this database table, there can be multiple language data/string. For example, English, Spanish, German, Bangla language etc..

Now when I create a PDF file based on MySQL table data it's contain something like that string !!

But the original string is :

I am using tcpdf and calling following class:

$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);