Often the clue is in the actual job call. Their description of what they want and what they're looking for should almost be recreated word for word in the initial statement of their resume.
Example I just pulled this off of the Working in Canada website ( a great resource BTW) for Security Guard http://www.workingincanada.gc.ca/home-eng.do?lang=eng
Their website:
Secure Protection Services is a security company in Calagary that specializes in mobile patrol inspections. Please visit us again at secureprotection.ca if you are looking for a reliable and efficient security company in Calgary and the surrounding areas
The job call online:
"Enforce regulations of establishments; Maintain order; Use telecommunications (i.e. two-way radio, cell phone, pager); Detect or prevent thefts and vandalism; Write reports"
Your resume buzz words would probably be:
Mobile patrol, reliable, efficient, use telecommunications , maintain order etc.
A bit simple but you get the idea