For EBSCO databases including OneSearch:
SU (canad* OR ontario OR ottawa OR "british columbia" OR alberta OR quebec OR saskatchewan OR manitoba OR toronto OR vancouver OR "nova scotia" OR "new brunswick" OR "prince edward island" OR newfoundland) OR TI (canad* OR ontario OR ottawa OR "british columbia" OR alberta OR quebec OR saskatchewan OR manitoba OR toronto OR vancouver OR "nova scotia" OR "new brunswick" OR "prince edward island" OR newfoundland)
In the Proquest CBCA database (which is mostly about Canadian issues), you can use LOC(canada) instead.
Not specified