“AND” Taxonomy Relation on tags

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Hi.
I just noticed that the Taxonomy Relation “AND” from the settings only works between categories and tags, but not between different tags.
My site is about a pastry shop. I have set categories like Cakes, Desserts etc, and tags which are Standard, Vegan, Sugar-free etc.

From the category filter i mark cakes, from the tags filter i mark sugar-free and vegan.
And in my results I get all cakes which are either sugar-free OR vegan.
I need it to display all cakes that are sugar-free AND vegan.

It is like the relation categories – tags is on AND, but the relation between tags is on OR.
Is this a bug, or it is a feature that the plug-in just doesn’t have?
And if it is the second, I saw on the advanced tab that there is “Advanced Query”. Can someone assist me in making the relation between tags to AND?
Thank in advance.
NOTE: I’m not much of a developer so please keep it simple 😀

The page I need help with: [log in to see the link]

 

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