Here's how I generate LI profile leads with Navigator, usually 300+ at a time for lead generation.
From Google.com enter this example search into the search box:
site:uk.linkedin.com/in AND ("Construction" OR "Roofer" OR "Home Builder" OR "Building Contractor" OR "Roofing specialist") AND (owner OR Director OR Proprietor) AND ("London" OR "Wembley")
You could customise this by adding AND (@gmail.com OR @yahoo.com) etc if you are looking for profiles with particular email addresses.
Note -
Edit to suit your niche.
I have changed my Google settings to show 100 results at a time.
The best results are if you niche down and search local area by area. Find a list from Wikipedia and use that as a base.
There are lots of ways to scrape the results from Google. I use SEO Minion extension for Chrome (cheap cost)
I throw this into excel and remove duplicates between searches.
Try the same with other search engines like Bing and Yahoo.
This is called Boolean Searches and is used extensively by recruitment and lead gen pros.