Certificate of employment from what country? If Singapore, that is not your home country. What are your prospects in the Phillipines? Show how much more you will be making to justify $40k+ education. You can mention land but it isn’t liquid.I applied us visa way back 2010 and got refused but i did mention it.
I submitted also Certificate of employment with payslip. I mention also we have a land with a value of $24000 too.