Question [Q] letters not appearing in ebook readers??

i recently downloaded Bhagavad gita.epub book and when i opened in aldiko it appears(boxes) as show in attachment, i tried other ebook readers and they appeared similar or with some spaces, the original characters where never shown in my device.

How to make those characters appear??

i have also provided a screen shot from my pc indicating how the boxes should appear.

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Hit *Thanks* if i have helped

Device: Xperia mini [Smultron]
Bootloader: Unlocked