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On askbot.org search is "or"-ed and on askbot.com "and"-ed, because on this site at the moment we are using MySQL as a database and on .com - postgres.
The difference is there because search is a function of a search engine, not the application (askbot/django in this case). Search works differently in MySQL, Postgres, etc.
Search function in Postgres is much more evolved, that's part of the reason why we recommend using PostgresQL as the database.