Search rubrics field

I would prefer that this field is not cleared when pushing the Search Button.

I would rather prefer to refine my search request in a stepwise manner by adding more text incrementally.

Example: I started searching for Argentum nitricum rubrics with “salt”.

I got quite a number of Rubrics.

In a next step, I would like to add text items such as “desire” or “aversion” or “agg” or “amel” or “fever”, to refine my search request.