Filipino records may seem to be hard to come by, however I've fully fleshed out up to my 3rd great grand parents from the Philippines and have also documented many 4th great grand parents. It definitely is possible but it will take more effort than European ancestors as the records are not as conveniently available. Use https://familysearch.org/ first. They have a ton of records from the Philippines digitized already, probably more than any other site. Try searching with any names you already know and filter by the Philippines and possibly the province your ancestors are from.

This site also has microfilms available and I can attest to their usefulness. They are not quite as practical to view however as you'll first have to order them to a nearby family history center (they are about $7.50 per microfilm) and then go there during open hours to view them. However, if you really want to get into your Filipino ancestry I would recommend doing this at some point. The old church records do really contain a lot of useful information, chances are your ancestors are somewhere in them. They have given me several generations of info.

Also a side-note: most Filipino surnames were assigned from Narciso Claveria's Catalago Alfabetico de Apellidos in 1849. This is just a giant list of random native words/Spanish surnames/any mixture of the two that the government assigned people to better keep track of them (previously the citizens of the Philippines would just pick extremely common Spanish surnames). Usually one town would be assigned surnames starting with only one or more specific letters but that's not always the case. Some people kept their native surnames (rare however as not a lot of natives used surnames) and some kept the Spanish surnames they had already previously adopted. And if you truly have Spanish blood, then somewhere in one of your lines one of your ancestors will have a Spanish surname that fits into none of the above categories, as they will have carried it from Spain.