You may combine search words with OR, AND and NOT. AND-expressions are evaluated before OR-expressions.
For instance the search expression aa AND bb OR cc will find all documents containing both aa and bb, plus all documents containing cc. You may also write this as ( aa AND bb ) OR cc.
The search expression aa OR bb AND NOT cc will find all documents containing bb and that does not contain cc, plus all documents containing aa. You may also write this as aa OR ( bb AND (NOT cc) ).
You can search for partial words by truncating them with *, for instance aa* will match all words beginning with aa. * by itself will match any word.
Enter your search expression and click on Search.