In 2016, I found an excellent printing press near our house -- Nafe Coop Printing Press. It is in the basement of CLIMBS Building, Zone 5, Upper Bulua, Cagayan de Oro, only a few steps from Gaisano Bulua. Nafe has split my children's textbooks, and repaired my damaged books. Send email to Nafe.
There are other printing shops in Cagayan de Oro that can split textbooks, such as the Mindanao Editorial and Printing Services (MEPS) and Legacy Printing Press.
Splitting the textbooks will decrease the weight of your children's schoolbags by 50 percent or more. The reduction will help your kids maintain good posture and prevent skeletal and muscular pain.
See "How I reduced the weight of my children's school bags."