It's highly likely that they haven't been mapped yet, or if they are, the local mapping convention is to drop the term "purok" from the name, and only use the place name. (e.g. Purok Santa Ana is named just "Santa Ana".)

OpenStreetMap is a collaborative mapping platform. If you know of places and features missing (or needs any correction) on the map, please feel free to contribute.

Check out how: https://learnosm.org.