| + |
You can indicate with + that a word has to appear in the keywords of the page ("+Otto +engine" gives results where Otto and engine appear as a keyword)
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| - |
With - you can indicate that a word mustn't be in the keywords ("+Otto -clown" gives results where Otto but not clown appear in the keywords)
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| Space |
A space before a keyword indicates that the following can be in the keywords but it's not necessary ("Otto engine" gives results where Otto or engine appear in the keywords).
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| " |
Finally you can indicate with quotation-marks that the text inside two quotation-marks has to be in the keywords. If you want to find keywords with quotation-marks inside the keyword, you can add a backslash (\) before the quotation mark. ("engine +"August Otto" +combustion" gives results, where engine, combustion and August Otto appear in the keywords).
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