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

> Setting up addon sync
    FORUMS / Operation Arrowhead / Troubleshooting   ||  Tags: 2009, Addon, Admin, Sync
> Lip sync in Arma 3?
    FORUMS / Editing / Scripting / Arma 3   ||  Tags: Arma 3, Arma Iii, Lip, Sync