To find biographies, combine your term(s) of interest with the subject term Canada biography
Canada -- biography
Here are some examples (start with a SUBJECT search and broaden to a keyword search if you don't get any results):
feminists canada biography
social workers canada biography
Broadcasters -- Canada -- Biography.
St. Catharines (Ont.) -- Biography (you can also use city names and provinces - broaden to a keyword search if you don't get any results)