You will have to focus on your TIES TO YOUR HOME COUNTRY. The fact you are working outside the Philippines makes an additional challenge to prove you will leave Canada before the end of the visa. You will have to show you have a solid job and a letter from your boss indicating that you have leave and are expected to return on xxx date. You will have to show what ties would bring you back to your home country/where you work. Do you own property, have a spouse/family. Do you have a reasonable bank balance? What is your travel history? Have you gone of holidays to other countries? This is what they are looking for to show you have the finances to pay for holidays and a history of returning home. Travel for work should also be stated, but won't have the same value as personal travel. Good Luck.