Why is google displaying MORE results if you EXCLUDE additional words trying to slim down the results?

Example:





Google: torrent paris: 290,000 hits.


Google: torrent paris -wallpaper: 2,160,000 hits





I see this very often when trying to slim down the number of search results. Often, the opposite effect is the result.


Obviously, Google does something wrong when searching it's databases. But what?





I have to emphasize that i DO NOT ask how to change my search strategy.





Technically, if i search for all sites with these words combined:


torrent paris


then the number of search results should be greater than if i search for sites which include


torrent paris


but exclude


wallpaper


.


(Too bad btw that i can't use leading spaces above - Yahoo deletes them.)





You can test it yourself by using other words. Often the number of results are lower if you enter more search demands, but often it does not - which is, to say the least, weird.





Please, don't turn the question into something else. I'm only interested in how Google's search methods work and why they don't follow logic.

Why is google displaying MORE results if you EXCLUDE additional words trying to slim down the results?
your hits are inaccurate....


http://www.google.co.uk/search?hl=en%26amp;q=t... is 259,000


wheras http://www.google.co.uk/search?hl=en%26amp;q=t... 291,000


which perfectly makes sense....
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