What does the Canadian Embassy Manila want?

From the documents you presented during your visa application. Consular Officer considers where you acquired the money you will be using in your alleged tour. Did you earn it from your work? How long have you been working in the company (tenure)?
Did you presented them with an ITR as proof that you are earning enough to pay for your trip.
Thats from my opinion what is missing and you should have provided.

Also considering that you are young and at the prime of your life, a consular officer forsees possible prospect of job hunting.
According to your statement limited employment opportunities of your profession in your country of residence
That is the painful image our young nurses face today. The difficulty of finding nursing oppurtunities . Its quite a stigma and such an unfortunate situation.

Also like I said from the previous post your student permit refusal also has affected your TRV application.

So my advise for you is wait for at least 6 months to 1 years then reapply. They will consider your application once your situation has changed. Or you have presented new evidence of ties here in the Philippines. Good luck

Factor in the state of the economy in western Canada. Permanent nursing positions will be taken by new grads before overseas hires.