Should getting no response in this timespan be understood as a no? What should I do in this situation?
Your time scale seems too short for me. Patience might be a virtue here. But sending the thesis and the request at the same time is probably a pretty heavy load to drop on a person. 

Ask your advisor to follow up with a request and a recommendation. It might be more successful coming from them than from you. 

But in general, making a request and offering to show related work in the initial request might be more successful than just sending it all at once. Some people get a lot of these requests and have learned to ignore them.