Can I use my Philippines passport with a visa to enter Canada and use?
Sure. If you are a US citizen then you MUST use the US passport to enter the US. If you are a dual citizen and it is for some reason advantageous to use the other passport to enter Canada. You may do so. Its not clear to me why just using the US passport, where you dont require a visa, wouldnt be the easier course. But its perfectly permissible to use the Philippine passport to enter Canada.