Several comma-separated tags will be considered as logical AND between them. You can also use semicolon for logical OR. AND has a priority over OR and you cannot use parentheses for logical grouping. Asterisk (*) within a tag will be regarded as a mask for "any string".

Found in forums

> Take On Testing: Focus Groups!
    FORUMS / Offtopic / Other Games / Take On Helicopters   ||  Tags: Beta, Bis, Czech, Test