how to make a precision cut on masonry brick

[AJ-DIYer]

hi

I have a few blocks as shared in the link below that I need to cut across to fit my project. I don't think getting an electric saw would be worth it. What options do I have? I tried to use hammer and chisel but it wasn't accurate and it didn't turn out right. 

https://www.bunnings.com.au/brighton-masonry-200-x-100-x-50mm-charcoal-mypave-215-paver_p3451529?reg...