& - logical AND.
For example, "explosion & boiler".
Search will find any URLs that contain both "explosion" and "boiler".
You can also use + for this operator.
| - logical OR.
For example "boiler | catapult".
Search will find any URLs that contain word "boiler" or word "catapult".
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Advanced boolean search
If you want more advanced results you may use query language.
Search understands the following boolean operators:
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~ - logical NOT.
For example "explosion & ~boiler".
Search will find URLs that contain word "explosion" and do not contain word "boiler" at the same time.
Note that ~ just excludes given word from results. Query "~boiler" will find nothing!
() - group command to compose more complex queries.
For example "(boiler | catapult) & ~explosion".
Query language is simple and powerful at the same time.
Just consider query as usual boolean expression.
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