Hello,
I am a FAA, GCAA, NCAA and MoTCA licensed flight dispatcher, I am currently the OCC manager and flight dispatch instructor & examiner with with an airline in Dubai, UAE. I have 11 years experience in flight dispatch. I want to relocate to Canada to work as a flight dispatcher and to get a work VISA I need a job offer, I have applied to several airline companies and have not received any reply as of yet, I guess it is because I have not done the TC generic exam and Radio license.

I need your advise on this, do you think if I travel to Canada to complete these exams and then start applying for the position, will it increase my chances?

Your problem is you don't have the right to work here.

In order to work here you need to have a legal right to work here.
For an employer to help you with a job offer towards a Temporary Foreign Worker work permit, they need to prove that they cannot find a suitable candidate in the available workforce in Canada. Which of course is not the case here.
Some options to be temporarily legal to work here : obtain a work holiday permit if your country has such an agreement with Canada, obtain a post-secondary degree at an eligible Canadian institution then apply for a post-graduate work permit, or obtain permanent residency.
Caveat : many companies will not hire you unless you have permanent residency or Canadian citizenship.

In addition to that most important requirement, in order to work as dispatch you need to have written the TC dispatch exam.