Request an unpublished paper owned by another (foreign) university
If the thesis is recent enough that it would have been written electronically, you can try to locate the author and ask if they would be able to send you an electronic copy.  This is a reasonable request.

Otherwise, talk to a librarian at your university library.  They almost certainly have some sort of inter-library loan that can get you a copy, or access to the original.  Requests like this are part of their job and this is a perfectly reasonable thing to ask them to help with.

Related:

Requesting a copy of the PhD thesis from an author?

Is it okay to ask someone for an (electronic) copy of their PhD thesis if it is not available online?