Searching the web has gone a bit crazy (I just searched for 'Apple' & scored 377,000,000 on Google). The answer is Boolean searches. You can see those odd AND, NOT, OR bits in the address bar to show them working.
If you're not sure what they mean, or want to teach simple Boolean logic, Boolify does it beautifully. If you can put 2 Lego blocks together, Boolify is for you. Just drag n drop the blocks to set up a search, & the result shows underneath straight away.
This Wikipedia article elegantly explains the principles (scroll past the Set Theory), but Boolify lets you see it happen. Worth a try.
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