First determine which region in Canada you would be willing to work in (ie: pick out a city such as Toronto/Montreal/Ottawa) than do a web search with keywords JOBS+TORONTO etc. You should get quite a few results.

Additionally, you can do similar search with keywords "EMPLOYMENT AGENCYS+TORONTO" etc.

Re: Reliable agency?
 

Hi There !!

Many recruitment agencies are available and you can serach for them in internet and try to choose one who get their agency fee from the employers.

Hope it helps :)