Short landing in Canada ,went back to homecountry, still need to file tax?

I did a short landing in Vancouver last August 2016,stayed for 2 weeks, acquired SIN and opened a bank account. I went back to Singapore as I am still working as a doctor. I returned to Vancouver in December 2016 for another 2 weeks then went back to Singapore until today and will be returning to Vancouver in August 2017.
My question is do I need to file tax return?
Thanks and kindly help me out.