How can I get many blogs on a particular topic? I have tried several footprints but almost all of them give me 300 results or less and I have paid proxies.
Google hard caps at 1000 results and often soft caps at 300. If you try it in a browser, they will literally remove the next button around result 300 and return no more results.
So you have to add on keywords like
query 1
query 2
query car
query cloud
query a
That forces google to return different sets of results from its database. Then just remove duplicate urls when you are done.