-operators, just as in Google query syntax, to indicate required and forbidden terms, respectively.
field:where <field> is the field name in the metadata (for instance, author).
text:"search engine"or just
author:WikiGuestto search for a wiki author, use their WikiName
form:WebFormNameto get all topics with that form attached.
type:docto get all attachments of given type
web:Sandboxto get all the topics in a given web
topic:WebHometo get all the topics of a given name
+web:Sandbox +topic:Testto get all the topics containing "Test" in their titles and belonging to the Sandbox web.