What type of issues are you having when you try to open the document?
Does it open?
Let us know
So what version of Word for mac are you using?
The first thing I would like to try is installing te additional fonts pack on your Mac.
Do you have your OSX disks?
If so could you put the dsk in the machine and browse to it, Once you have the disk open could you double-click Fonts for Additional Languages and install the Hindi and any other fonts you need.
Once finished reboot your mac and try the message again.