Thank you Nadine.
However, that is not what I wanted to accomplish, I am aware of that functionality.
Basically what I'm saying is that info for keywords doesn't match when this 'Only show ideas closely related to my search terms' is selected and when not.
For example, if I search for "cheap computer" the search volume would be let's say 15 000 000 because Google sums up searches for "cheap pc's", "cheap electronics" and similar. And if I select EXACT match, search volume would be much less, let's say 500 000, because Google will include only keywords like "used cheap computer", "cheap computer on sale" and similar, and not the ones it used to above that even don't contain 'computer' in their text.