That book doesn't have a digital edition.
Your options:

1. Buy used/second-hand copy from OLX : https://www.olx.ph/all-results/q-The-Law-on-Partnerships-and-Private-Corporations/

2. Go to the National Library and borrow a copy. http://www.elib.gov.ph/details.php?uid=18a7f8cf0f4af23f7cbc1d0f9d4af31d&tab=2