The list of required documents varies depending on your circumstances. But generally, you need to provide documentation about:
- Your identity
- Proof of financial capacity to travel
- Proof of your ties in the Philippines
- Your itinerary, purpose of visit
- Letter of invitation, if applicable
You may get more information here: http://www.canadainternational.gc.ca/philippines/
If you plan to do it yourself, read this first: Visiting Canada | Canadian Tourist Visa Application.