default the search engine tries to locate pages which have exact matches for
all of the words entered in your search query. If that fails, it then
tries to locate pages which contain any words in your search query.
If that happens a short message is displayed at the top of the search results
indicating this has been done.
there are several ways to modify the default search behavior.
All of these techniques
can be combined: +alway* -ne??r*
- + and -
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
- * wildcard
If a query word ends with a * all words on a page which start the
same way as that query word will match.
- ? wildcard
If a query word contains a ? any character will match that position.