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1. + and - qualifiers
If you prepend a word with + that word is required to be on the page.
If you prepend a word with - that word is required to not be on the page.
Example: +always -never
2. * wildcard
If a query word ends with a * all words on a page which start the same way as that query word will match.
3. ? wildcard
If a query word contains a ? any character will match that position.
All of these techniques can be combined: +alway* -ne??r*