FYI, teaching jobs are actually one of the better jobs for a Filipino. With the latest government raises and with benefits, local bonuses, and incentives, public school starts at a$500 per month. Here in Angeles it actually amounts to $600-700 starting. The problem is that you must be a licensed Filipino teacher.
There are some teaching jobs for native English speakers however they are in great demand. St. Pauls American Christian School on Clark employs teachers from the US, but they also must licensed in the US.
I have a company on Clark and we have four English class each week by an expat to improve our employees English and communication style. We also just opened an American school in Angeles myself and we have 7 Filipino teachers and 1 part time native English teacher. The need for the native English teacher is so that we can ensure that the students (5 of which are mine

) learn proper English and not Tanglish.
I have seen Gene's suggestion about teaching online to Korea work in a small scale so that could be a good option. However you have to deal with the poor internet connections here. If anyone does that, make sure that you have at least two connections. The students are not happy and not forgiving if you miss a class due to no internet. I know of one company that was doing quite well with this business model but lost all their customers after having an internet outage for a couple of days.
Mike