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If I type in "internet marketing", I will get one set of results.
But if I type in internet marketing, I will get a different set of results.
The "internet marketing" is a SQL query for exact match (i.e anything that contains the phrase - internet marketing.
The other, will just return results that have eithor internet or marketing or both.
A better way to find the true competition is the allinanchor:
allinanchor:keyword phrase
That will tell you the top sites that use that phrase as incoming link text. That is good info.