why cant i exclude a category when searching?

need an exclude category option, im seriously getting sick of having to type "-phone -ipad -iphone -samsung -apple -sony" after near every search i do

 

 29000 search results with 28900 of them in the phones category and if i know for sure im not looking for something to do with phones then i have to open all of the other 26 categories, which only contain 2 or 3 items each, one by one or in 26 separate windows just to look at 100 items.

 

 

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You can save a search.

Or copy what you type onto a sticky note on your desktop then just paste it in every time.