Q:

Search Google for domains rather than pages

I want to search for job sites in Alberta, Canada. One way to proceed is to do the usual Google search for them and then somehow loop through the results for the domains that seem to correspond to job sites.
Many of them will come from the principal job sites such as monster.com or indeed.ca. Fewer will come from lesser known sites that would still be of interest to job seekers. What I want to be able to do is to collect domains and subdomains. 
For instance, and thinking procedurally, once I have encountered and noted monster.com I want to ignore subsequence occurrences of it. I want to continue to look for distinct, new domains and subdomains. Any thoughts?
I haven't found a way of doing this with any collection of Google operators. Is there a way? If that's not possible, what would be a good way of doing it?

A:

What about something like this site:ca jobs alberta?
Turning Instant Search on will get rid of the redundant domains (it's okay to hit enter and get finer results). Here are the Instant Search results:

A:

What about related:jobs.alberta.ca?

